d9a5aa8e2d
Change all the cstval_pred_ty based PatternMatch helpers (things like m_AllOnes and m_Zero) to only allow poison elements inside vector splats, not undef elements. Historically, we used to represent non-demanded elements in vectors using undef. Nowadays, we use poison instead. As such, I believe that support for undef in vector splats is no longer useful. At the same time, while poison splat elements are pretty much always safe to ignore, this is not generally the case for undef elements. We have existing miscompiles in our tests due to this (see the masked-merge-*.ll tests changed here) and it's easy to miss such cases in the future, now that we write tests using poison instead of undef elements. I think overall, keeping support for undef elements no longer makes sense, and we should drop it. Once this is done consistently, I think we may also consider allowing poison in m_APInt by default, as doing that change is much less risky than doing the same with undef. This change involves a substantial amount of test changes. For most tests, I've just replaced undef with poison, as I don't think there is value in retaining both. For some tests (where the distinction between undef and poison is important), I've duplicated tests.
531 lines
15 KiB
LLVM
531 lines
15 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instsimplify -S | FileCheck %s
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;; x * 0 ==> 0 when no-nans and no-signed-zero
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define float @mul_zero_1(float %a) {
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; CHECK-LABEL: @mul_zero_1(
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; CHECK-NEXT: ret float 0.000000e+00
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;
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%b = fmul nsz nnan float %a, 0.0
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ret float %b
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}
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define float @mul_zero_2(float %a) {
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; CHECK-LABEL: @mul_zero_2(
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; CHECK-NEXT: ret float 0.000000e+00
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;
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%b = fmul fast float 0.0, %a
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ret float %b
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}
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define <2 x float> @mul_zero_nsz_nnan_vec_poison(<2 x float> %a) {
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; CHECK-LABEL: @mul_zero_nsz_nnan_vec_poison(
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; CHECK-NEXT: ret <2 x float> zeroinitializer
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;
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%b = fmul nsz nnan <2 x float> %a, <float 0.0, float poison>
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ret <2 x float> %b
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}
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;; x * 0 =/=> 0 when there could be nans or -0
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define float @no_mul_zero_1(float %a) {
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; CHECK-LABEL: @no_mul_zero_1(
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; CHECK-NEXT: [[B:%.*]] = fmul nsz float [[A:%.*]], 0.000000e+00
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; CHECK-NEXT: ret float [[B]]
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;
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%b = fmul nsz float %a, 0.0
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ret float %b
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}
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define float @no_mul_zero_2(float %a) {
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; CHECK-LABEL: @no_mul_zero_2(
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; CHECK-NEXT: [[B:%.*]] = fmul nnan float [[A:%.*]], 0.000000e+00
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; CHECK-NEXT: ret float [[B]]
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;
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%b = fmul nnan float %a, 0.0
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ret float %b
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}
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define float @no_mul_zero_3(float %a) {
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; CHECK-LABEL: @no_mul_zero_3(
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; CHECK-NEXT: [[B:%.*]] = fmul float [[A:%.*]], 0.000000e+00
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; CHECK-NEXT: ret float [[B]]
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;
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%b = fmul float %a, 0.0
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ret float %b
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}
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; -X + X --> 0.0 (with nnan on the fadd)
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define float @fadd_binary_fnegx(float %x) {
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; CHECK-LABEL: @fadd_binary_fnegx(
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; CHECK-NEXT: ret float 0.000000e+00
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;
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%negx = fsub float -0.0, %x
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%r = fadd nnan float %negx, %x
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ret float %r
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}
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define float @fadd_unary_fnegx(float %x) {
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; CHECK-LABEL: @fadd_unary_fnegx(
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; CHECK-NEXT: ret float 0.000000e+00
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;
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%negx = fneg float %x
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%r = fadd nnan float %negx, %x
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ret float %r
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}
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; X + -X --> 0.0 (with nnan on the fadd)
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define <2 x float> @fadd_binary_fnegx_commute_vec(<2 x float> %x) {
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; CHECK-LABEL: @fadd_binary_fnegx_commute_vec(
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; CHECK-NEXT: ret <2 x float> zeroinitializer
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;
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%negx = fsub <2 x float> <float -0.0, float -0.0>, %x
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%r = fadd nnan <2 x float> %x, %negx
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ret <2 x float> %r
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}
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define <2 x float> @fadd_unary_fnegx_commute_vec(<2 x float> %x) {
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; CHECK-LABEL: @fadd_unary_fnegx_commute_vec(
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; CHECK-NEXT: ret <2 x float> zeroinitializer
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;
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%negx = fneg <2 x float> %x
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%r = fadd nnan <2 x float> %x, %negx
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ret <2 x float> %r
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}
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define <2 x float> @fadd_fnegx_commute_vec_poison(<2 x float> %x) {
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; CHECK-LABEL: @fadd_fnegx_commute_vec_poison(
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; CHECK-NEXT: ret <2 x float> zeroinitializer
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;
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%negx = fsub <2 x float> <float poison, float -0.0>, %x
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%r = fadd nnan <2 x float> %x, %negx
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ret <2 x float> %r
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}
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; https://bugs.llvm.org/show_bug.cgi?id=26958
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; https://bugs.llvm.org/show_bug.cgi?id=27151
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define float @fadd_binary_fneg_nan(float %x) {
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; CHECK-LABEL: @fadd_binary_fneg_nan(
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; CHECK-NEXT: [[T:%.*]] = fsub nnan float -0.000000e+00, [[X:%.*]]
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; CHECK-NEXT: [[COULD_BE_NAN:%.*]] = fadd ninf float [[T]], [[X]]
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; CHECK-NEXT: ret float [[COULD_BE_NAN]]
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;
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%t = fsub nnan float -0.0, %x
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%could_be_nan = fadd ninf float %t, %x
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ret float %could_be_nan
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}
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define float @fadd_unary_fneg_nan(float %x) {
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; CHECK-LABEL: @fadd_unary_fneg_nan(
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; CHECK-NEXT: [[T:%.*]] = fneg nnan float [[X:%.*]]
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; CHECK-NEXT: [[COULD_BE_NAN:%.*]] = fadd ninf float [[T]], [[X]]
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; CHECK-NEXT: ret float [[COULD_BE_NAN]]
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;
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%t = fneg nnan float %x
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%could_be_nan = fadd ninf float %t, %x
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ret float %could_be_nan
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}
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define float @fadd_binary_fneg_nan_commute(float %x) {
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; CHECK-LABEL: @fadd_binary_fneg_nan_commute(
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; CHECK-NEXT: [[T:%.*]] = fsub nnan ninf float -0.000000e+00, [[X:%.*]]
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; CHECK-NEXT: [[COULD_BE_NAN:%.*]] = fadd float [[X]], [[T]]
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; CHECK-NEXT: ret float [[COULD_BE_NAN]]
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;
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%t = fsub nnan ninf float -0.0, %x
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%could_be_nan = fadd float %x, %t
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ret float %could_be_nan
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}
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define float @fadd_unary_fneg_nan_commute(float %x) {
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; CHECK-LABEL: @fadd_unary_fneg_nan_commute(
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; CHECK-NEXT: [[T:%.*]] = fneg nnan ninf float [[X:%.*]]
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; CHECK-NEXT: [[COULD_BE_NAN:%.*]] = fadd float [[X]], [[T]]
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; CHECK-NEXT: ret float [[COULD_BE_NAN]]
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;
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%t = fneg nnan ninf float %x
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%could_be_nan = fadd float %x, %t
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ret float %could_be_nan
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}
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; X + (0.0 - X) --> 0.0 (with nnan on the fadd)
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define float @fadd_fsub_nnan_ninf(float %x) {
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; CHECK-LABEL: @fadd_fsub_nnan_ninf(
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; CHECK-NEXT: ret float 0.000000e+00
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;
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%sub = fsub float 0.0, %x
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%zero = fadd nnan ninf float %x, %sub
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ret float %zero
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}
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; (0.0 - X) + X --> 0.0 (with nnan on the fadd)
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define <2 x float> @fadd_fsub_nnan_ninf_commute_vec(<2 x float> %x) {
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; CHECK-LABEL: @fadd_fsub_nnan_ninf_commute_vec(
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; CHECK-NEXT: ret <2 x float> zeroinitializer
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;
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%sub = fsub <2 x float> zeroinitializer, %x
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%zero = fadd nnan ninf <2 x float> %sub, %x
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ret <2 x float> %zero
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}
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; 'ninf' is not required because 'nnan' allows us to assume
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; that X is not INF or -INF (adding opposite INFs would be NaN).
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define float @fadd_fsub_nnan(float %x) {
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; CHECK-LABEL: @fadd_fsub_nnan(
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; CHECK-NEXT: ret float 0.000000e+00
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;
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%sub = fsub float 0.0, %x
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%zero = fadd nnan float %sub, %x
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ret float %zero
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}
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; fsub nnan x, x ==> 0.0
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define float @fsub_x_x(float %a) {
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; CHECK-LABEL: @fsub_x_x(
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; CHECK-NEXT: [[NO_ZERO1:%.*]] = fsub ninf float [[A:%.*]], [[A]]
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; CHECK-NEXT: [[NO_ZERO2:%.*]] = fsub float [[A]], [[A]]
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; CHECK-NEXT: [[NO_ZERO:%.*]] = fadd float [[NO_ZERO1]], [[NO_ZERO2]]
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; CHECK-NEXT: ret float [[NO_ZERO]]
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;
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; X - X ==> 0
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%zero1 = fsub nnan float %a, %a
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; Dont fold
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%no_zero1 = fsub ninf float %a, %a
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%no_zero2 = fsub float %a, %a
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%no_zero = fadd float %no_zero1, %no_zero2
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; Should get folded
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%ret = fadd nsz float %no_zero, %zero1
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ret float %ret
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}
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; fsub nsz 0.0, (fsub 0.0, X) ==> X
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define float @fsub_0_0_x(float %a) {
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; CHECK-LABEL: @fsub_0_0_x(
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; CHECK-NEXT: ret float [[A:%.*]]
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;
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%t1 = fsub float 0.0, %a
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%ret = fsub nsz float 0.0, %t1
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ret float %ret
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}
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; fsub nsz 0.0, (fneg X) ==> X
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define float @fneg_x(float %a) {
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; CHECK-LABEL: @fneg_x(
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; CHECK-NEXT: ret float [[A:%.*]]
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;
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%t1 = fneg float %a
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%ret = fsub nsz float 0.0, %t1
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ret float %ret
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}
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define <2 x float> @fsub_0_0_x_vec_poison1(<2 x float> %a) {
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; CHECK-LABEL: @fsub_0_0_x_vec_poison1(
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; CHECK-NEXT: ret <2 x float> [[A:%.*]]
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;
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%t1 = fsub <2 x float> <float 0.0, float poison>, %a
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%ret = fsub nsz <2 x float> zeroinitializer, %t1
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ret <2 x float> %ret
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}
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define <2 x float> @fneg_x_vec_poison1(<2 x float> %a) {
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; CHECK-LABEL: @fneg_x_vec_poison1(
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; CHECK-NEXT: ret <2 x float> [[A:%.*]]
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;
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%t1 = fneg <2 x float> %a
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%ret = fsub nsz <2 x float> <float 0.0, float poison>, %t1
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ret <2 x float> %ret
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}
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define <2 x float> @fsub_0_0_x_vec_poison2(<2 x float> %a) {
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; CHECK-LABEL: @fsub_0_0_x_vec_poison2(
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; CHECK-NEXT: ret <2 x float> [[A:%.*]]
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;
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%t1 = fsub <2 x float> zeroinitializer, %a
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%ret = fsub nsz <2 x float> <float poison, float -0.0>, %t1
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ret <2 x float> %ret
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}
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; fadd nsz X, 0 ==> X
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define <2 x float> @fadd_zero_nsz_vec(<2 x float> %x) {
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; CHECK-LABEL: @fadd_zero_nsz_vec(
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; CHECK-NEXT: ret <2 x float> [[X:%.*]]
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;
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%r = fadd nsz <2 x float> %x, zeroinitializer
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ret <2 x float> %r
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}
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define <2 x float> @fadd_zero_nsz_vec_poison(<2 x float> %x) {
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; CHECK-LABEL: @fadd_zero_nsz_vec_poison(
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; CHECK-NEXT: ret <2 x float> [[X:%.*]]
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;
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%r = fadd nsz <2 x float> %x, <float 0.0, float poison>
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ret <2 x float> %r
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}
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define float @nofold_fadd_x_0(float %a) {
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; CHECK-LABEL: @nofold_fadd_x_0(
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; CHECK-NEXT: [[NO_ZERO1:%.*]] = fadd ninf float [[A:%.*]], 0.000000e+00
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; CHECK-NEXT: [[NO_ZERO2:%.*]] = fadd nnan float [[A]], 0.000000e+00
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; CHECK-NEXT: [[NO_ZERO:%.*]] = fadd float [[NO_ZERO1]], [[NO_ZERO2]]
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; CHECK-NEXT: ret float [[NO_ZERO]]
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;
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; Dont fold
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%no_zero1 = fadd ninf float %a, 0.0
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%no_zero2 = fadd nnan float %a, 0.0
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%no_zero = fadd float %no_zero1, %no_zero2
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ret float %no_zero
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}
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define float @fold_fadd_nsz_x_0(float %a) {
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; CHECK-LABEL: @fold_fadd_nsz_x_0(
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; CHECK-NEXT: ret float [[A:%.*]]
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;
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%add = fadd nsz float %a, 0.0
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ret float %add
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}
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; 'nsz' does not guarantee that -0.0 does not occur, so this does not simplify.
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define float @fold_fadd_cannot_be_neg0_nsz_src_x_0(float %a, float %b) {
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; CHECK-LABEL: @fold_fadd_cannot_be_neg0_nsz_src_x_0(
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; CHECK-NEXT: [[NSZ:%.*]] = fmul nsz float [[A:%.*]], [[B:%.*]]
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; CHECK-NEXT: [[ADD:%.*]] = fadd float [[NSZ]], 0.000000e+00
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; CHECK-NEXT: ret float [[ADD]]
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;
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%nsz = fmul nsz float %a, %b
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%add = fadd float %nsz, 0.0
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ret float %add
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}
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define float @fold_fadd_cannot_be_neg0_fabs_src_x_0(float %a) {
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; CHECK-LABEL: @fold_fadd_cannot_be_neg0_fabs_src_x_0(
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; CHECK-NEXT: [[FABS:%.*]] = call float @llvm.fabs.f32(float [[A:%.*]])
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; CHECK-NEXT: ret float [[FABS]]
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;
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%fabs = call float @llvm.fabs.f32(float %a)
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%add = fadd float %fabs, 0.0
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ret float %add
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}
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; 'nsz' does not guarantee that -0.0 does not occur, so this does not simplify.
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define float @fold_fadd_cannot_be_neg0_sqrt_nsz_src_x_0(float %a, float %b) {
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; CHECK-LABEL: @fold_fadd_cannot_be_neg0_sqrt_nsz_src_x_0(
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; CHECK-NEXT: [[NSZ:%.*]] = fmul nsz float [[A:%.*]], [[B:%.*]]
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; CHECK-NEXT: [[SQRT:%.*]] = call float @llvm.sqrt.f32(float [[NSZ]])
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; CHECK-NEXT: [[ADD:%.*]] = fadd float [[SQRT]], 0.000000e+00
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; CHECK-NEXT: ret float [[ADD]]
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;
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%nsz = fmul nsz float %a, %b
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%sqrt = call float @llvm.sqrt.f32(float %nsz)
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%add = fadd float %sqrt, 0.0
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ret float %add
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}
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; 'nsz' does not guarantee that -0.0 does not occur, so this does not simplify.
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define float @fold_fadd_cannot_be_neg0_canonicalize_nsz_src_x_0(float %a, float %b) {
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; CHECK-LABEL: @fold_fadd_cannot_be_neg0_canonicalize_nsz_src_x_0(
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; CHECK-NEXT: [[NSZ:%.*]] = fmul nsz float [[A:%.*]], [[B:%.*]]
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; CHECK-NEXT: [[CANON:%.*]] = call float @llvm.canonicalize.f32(float [[NSZ]])
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; CHECK-NEXT: [[ADD:%.*]] = fadd float [[CANON]], 0.000000e+00
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; CHECK-NEXT: ret float [[ADD]]
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;
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%nsz = fmul nsz float %a, %b
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%canon = call float @llvm.canonicalize.f32(float %nsz)
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%add = fadd float %canon, 0.0
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ret float %add
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}
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; fdiv nsz nnan 0, X ==> 0
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; 0 / X -> 0
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define double @fdiv_zero_by_x(double %x) {
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; CHECK-LABEL: @fdiv_zero_by_x(
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; CHECK-NEXT: ret double 0.000000e+00
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;
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%r = fdiv nnan nsz double 0.0, %x
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ret double %r
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}
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define <2 x double> @fdiv_zero_by_x_vec_poison(<2 x double> %x) {
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; CHECK-LABEL: @fdiv_zero_by_x_vec_poison(
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; CHECK-NEXT: ret <2 x double> zeroinitializer
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;
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%r = fdiv nnan nsz <2 x double> <double 0.0, double poison>, %x
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ret <2 x double> %r
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}
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; 0 % X -> 0
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; nsz is not necessary - frem result always has the sign of the dividend
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define double @frem_zero_by_x(double %x) {
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; CHECK-LABEL: @frem_zero_by_x(
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; CHECK-NEXT: ret double 0.000000e+00
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;
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%r = frem nnan double 0.0, %x
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ret double %r
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}
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define <2 x double> @frem_poszero_by_x_vec_poison(<2 x double> %x) {
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; CHECK-LABEL: @frem_poszero_by_x_vec_poison(
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; CHECK-NEXT: ret <2 x double> zeroinitializer
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;
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%r = frem nnan <2 x double> <double 0.0, double poison>, %x
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ret <2 x double> %r
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}
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; -0 % X -> -0
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; nsz is not necessary - frem result always has the sign of the dividend
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define double @frem_negzero_by_x(double %x) {
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; CHECK-LABEL: @frem_negzero_by_x(
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; CHECK-NEXT: ret double -0.000000e+00
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;
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%r = frem nnan double -0.0, %x
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ret double %r
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}
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define <2 x double> @frem_negzero_by_x_vec_poison(<2 x double> %x) {
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; CHECK-LABEL: @frem_negzero_by_x_vec_poison(
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; CHECK-NEXT: ret <2 x double> <double -0.000000e+00, double -0.000000e+00>
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;
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%r = frem nnan <2 x double> <double poison, double -0.0>, %x
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ret <2 x double> %r
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}
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define float @fdiv_self(float %f) {
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; CHECK-LABEL: @fdiv_self(
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; CHECK-NEXT: ret float 1.000000e+00
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|
;
|
|
%div = fdiv nnan float %f, %f
|
|
ret float %div
|
|
}
|
|
|
|
define float @fdiv_self_invalid(float %f) {
|
|
; CHECK-LABEL: @fdiv_self_invalid(
|
|
; CHECK-NEXT: [[DIV:%.*]] = fdiv float [[F:%.*]], [[F]]
|
|
; CHECK-NEXT: ret float [[DIV]]
|
|
;
|
|
%div = fdiv float %f, %f
|
|
ret float %div
|
|
}
|
|
|
|
define float @fdiv_neg1(float %f) {
|
|
; CHECK-LABEL: @fdiv_neg1(
|
|
; CHECK-NEXT: ret float -1.000000e+00
|
|
;
|
|
%neg = fsub fast float -0.000000e+00, %f
|
|
%div = fdiv nnan float %neg, %f
|
|
ret float %div
|
|
}
|
|
|
|
define float @fdiv_neg2(float %f) {
|
|
; CHECK-LABEL: @fdiv_neg2(
|
|
; CHECK-NEXT: ret float -1.000000e+00
|
|
;
|
|
%neg = fsub fast float 0.000000e+00, %f
|
|
%div = fdiv nnan float %neg, %f
|
|
ret float %div
|
|
}
|
|
|
|
define float @fdiv_neg_invalid(float %f) {
|
|
; CHECK-LABEL: @fdiv_neg_invalid(
|
|
; CHECK-NEXT: [[NEG:%.*]] = fsub fast float -0.000000e+00, [[F:%.*]]
|
|
; CHECK-NEXT: [[DIV:%.*]] = fdiv float [[NEG]], [[F]]
|
|
; CHECK-NEXT: ret float [[DIV]]
|
|
;
|
|
%neg = fsub fast float -0.000000e+00, %f
|
|
%div = fdiv float %neg, %f
|
|
ret float %div
|
|
}
|
|
|
|
define float @fdiv_neg_swapped1(float %f) {
|
|
; CHECK-LABEL: @fdiv_neg_swapped1(
|
|
; CHECK-NEXT: ret float -1.000000e+00
|
|
;
|
|
%neg = fsub float -0.000000e+00, %f
|
|
%div = fdiv nnan float %f, %neg
|
|
ret float %div
|
|
}
|
|
|
|
define float @fdiv_neg_swapped2(float %f) {
|
|
; CHECK-LABEL: @fdiv_neg_swapped2(
|
|
; CHECK-NEXT: ret float -1.000000e+00
|
|
;
|
|
%neg = fsub float 0.000000e+00, %f
|
|
%div = fdiv nnan float %f, %neg
|
|
ret float %div
|
|
}
|
|
|
|
define <2 x float> @fdiv_neg_vec_poison_elt(<2 x float> %f) {
|
|
; CHECK-LABEL: @fdiv_neg_vec_poison_elt(
|
|
; CHECK-NEXT: ret <2 x float> <float -1.000000e+00, float -1.000000e+00>
|
|
;
|
|
%neg = fsub <2 x float> <float 0.0, float poison>, %f
|
|
%div = fdiv nnan <2 x float> %f, %neg
|
|
ret <2 x float> %div
|
|
}
|
|
|
|
; PR21126: http://llvm.org/bugs/show_bug.cgi?id=21126
|
|
; With loose math, sqrt(X) * sqrt(X) is just X.
|
|
|
|
declare double @llvm.sqrt.f64(double)
|
|
|
|
define double @sqrt_squared(double %f) {
|
|
; CHECK-LABEL: @sqrt_squared(
|
|
; CHECK-NEXT: ret double [[F:%.*]]
|
|
;
|
|
%sqrt = call double @llvm.sqrt.f64(double %f)
|
|
%mul = fmul reassoc nnan nsz double %sqrt, %sqrt
|
|
ret double %mul
|
|
}
|
|
|
|
; Negative tests for the above transform: we need all 3 of those flags.
|
|
|
|
define double @sqrt_squared_not_fast_enough1(double %f) {
|
|
; CHECK-LABEL: @sqrt_squared_not_fast_enough1(
|
|
; CHECK-NEXT: [[SQRT:%.*]] = call double @llvm.sqrt.f64(double [[F:%.*]])
|
|
; CHECK-NEXT: [[MUL:%.*]] = fmul nnan nsz double [[SQRT]], [[SQRT]]
|
|
; CHECK-NEXT: ret double [[MUL]]
|
|
;
|
|
%sqrt = call double @llvm.sqrt.f64(double %f)
|
|
%mul = fmul nnan nsz double %sqrt, %sqrt
|
|
ret double %mul
|
|
}
|
|
|
|
define double @sqrt_squared_not_fast_enough2(double %f) {
|
|
; CHECK-LABEL: @sqrt_squared_not_fast_enough2(
|
|
; CHECK-NEXT: [[SQRT:%.*]] = call double @llvm.sqrt.f64(double [[F:%.*]])
|
|
; CHECK-NEXT: [[MUL:%.*]] = fmul reassoc nnan double [[SQRT]], [[SQRT]]
|
|
; CHECK-NEXT: ret double [[MUL]]
|
|
;
|
|
%sqrt = call double @llvm.sqrt.f64(double %f)
|
|
%mul = fmul reassoc nnan double %sqrt, %sqrt
|
|
ret double %mul
|
|
}
|
|
|
|
define double @sqrt_squared_not_fast_enough3(double %f) {
|
|
; CHECK-LABEL: @sqrt_squared_not_fast_enough3(
|
|
; CHECK-NEXT: [[SQRT:%.*]] = call double @llvm.sqrt.f64(double [[F:%.*]])
|
|
; CHECK-NEXT: [[MUL:%.*]] = fmul reassoc nsz double [[SQRT]], [[SQRT]]
|
|
; CHECK-NEXT: ret double [[MUL]]
|
|
;
|
|
%sqrt = call double @llvm.sqrt.f64(double %f)
|
|
%mul = fmul reassoc nsz double %sqrt, %sqrt
|
|
ret double %mul
|
|
}
|
|
|
|
declare float @llvm.fabs.f32(float)
|
|
declare float @llvm.sqrt.f32(float)
|
|
declare float @llvm.canonicalize.f32(float)
|