3c514d31d7
Update the EarlyCSE tests to use opaque pointers. Worth noting that this leaves some bitcast ptr to ptr instructions in the input IR behind which are no longer necessary. This is because these use numbered instructions, so it's hard to drop them in an automated fashion (as it would require renumbering all other instructions as well). I'm leaving that as a problem for another day. The test updates have been performed using https://gist.github.com/nikic/98357b71fd67756b0f064c9517b62a34. Differential Revision: https://reviews.llvm.org/D127278
175 lines
3.9 KiB
LLVM
175 lines
3.9 KiB
LLVM
; RUN: opt -early-cse -earlycse-debug-hash -S < %s | FileCheck %s
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; RUN: opt -basic-aa -early-cse-memssa -S < %s | FileCheck %s
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; Same as GVN/edge.ll, but updated to reflect EarlyCSE's less powerful
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; implementation. EarlyCSE currently doesn't exploit equality comparisons
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; against constants.
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define i32 @f1(i32 %x) {
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; CHECK-LABEL: define i32 @f1(
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bb0:
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%cmp = icmp eq i32 %x, 0
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br i1 %cmp, label %bb2, label %bb1
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bb1:
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br label %bb2
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bb2:
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%cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
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%foo = add i32 %cond, %x
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ret i32 %foo
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; CHECK: bb2:
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; CHECK: %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
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}
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define i32 @f2(i32 %x) {
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; CHECK-LABEL: define i32 @f2(
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bb0:
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%cmp = icmp ne i32 %x, 0
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br i1 %cmp, label %bb1, label %bb2
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bb1:
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br label %bb2
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bb2:
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%cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
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%foo = add i32 %cond, %x
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ret i32 %foo
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; CHECK: bb2:
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; CHECK: %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
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}
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define i32 @f3(i32 %x) {
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; CHECK-LABEL: define i32 @f3(
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bb0:
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switch i32 %x, label %bb1 [ i32 0, label %bb2]
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bb1:
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br label %bb2
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bb2:
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%cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
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%foo = add i32 %cond, %x
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ret i32 %foo
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; CHECK: bb2:
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; CHECK: %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
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}
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declare void @g(i1)
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define void @f4(ptr %x) {
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; CHECK-LABEL: define void @f4(
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bb0:
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%y = icmp eq ptr null, %x
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br i1 %y, label %bb2, label %bb1
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bb1:
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br label %bb2
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bb2:
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%zed = icmp eq ptr null, %x
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call void @g(i1 %zed)
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; CHECK: call void @g(i1 %y)
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ret void
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}
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define double @fcmp_oeq_not_zero(double %x, double %y) {
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entry:
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%cmp = fcmp oeq double %y, 2.0
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br i1 %cmp, label %if, label %return
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if:
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%div = fdiv double %x, %y
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br label %return
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return:
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%retval = phi double [ %div, %if ], [ %x, %entry ]
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ret double %retval
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; CHECK-LABEL: define double @fcmp_oeq_not_zero(
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; CHECK: %div = fdiv double %x, %y
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}
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define double @fcmp_une_not_zero(double %x, double %y) {
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entry:
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%cmp = fcmp une double %y, 2.0
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br i1 %cmp, label %return, label %else
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else:
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%div = fdiv double %x, %y
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br label %return
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return:
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%retval = phi double [ %div, %else ], [ %x, %entry ]
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ret double %retval
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; CHECK-LABEL: define double @fcmp_une_not_zero(
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; CHECK: %div = fdiv double %x, %y
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}
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; PR22376 - We can't propagate zero constants because -0.0
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; compares equal to 0.0. If %y is -0.0 in this test case,
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; we would produce the wrong sign on the infinity return value.
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define double @fcmp_oeq_zero(double %x, double %y) {
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entry:
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%cmp = fcmp oeq double %y, 0.0
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br i1 %cmp, label %if, label %return
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if:
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%div = fdiv double %x, %y
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br label %return
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return:
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%retval = phi double [ %div, %if ], [ %x, %entry ]
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ret double %retval
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; CHECK-LABEL: define double @fcmp_oeq_zero(
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; CHECK: %div = fdiv double %x, %y
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}
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define double @fcmp_une_zero(double %x, double %y) {
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entry:
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%cmp = fcmp une double %y, -0.0
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br i1 %cmp, label %return, label %else
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else:
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%div = fdiv double %x, %y
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br label %return
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return:
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%retval = phi double [ %div, %else ], [ %x, %entry ]
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ret double %retval
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; CHECK-LABEL: define double @fcmp_une_zero(
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; CHECK: %div = fdiv double %x, %y
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}
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; We also cannot propagate a value if it's not a constant.
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; This is because the value could be 0.0 or -0.0.
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define double @fcmp_oeq_maybe_zero(double %x, double %y, double %z1, double %z2) {
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entry:
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%z = fadd double %z1, %z2
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%cmp = fcmp oeq double %y, %z
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br i1 %cmp, label %if, label %return
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if:
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%div = fdiv double %x, %z
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br label %return
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return:
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%retval = phi double [ %div, %if ], [ %x, %entry ]
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ret double %retval
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; CHECK-LABEL: define double @fcmp_oeq_maybe_zero(
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; CHECK: %div = fdiv double %x, %z
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}
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define double @fcmp_une_maybe_zero(double %x, double %y, double %z1, double %z2) {
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entry:
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%z = fadd double %z1, %z2
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%cmp = fcmp une double %y, %z
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br i1 %cmp, label %return, label %else
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else:
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%div = fdiv double %x, %z
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br label %return
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return:
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%retval = phi double [ %div, %else ], [ %x, %entry ]
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ret double %retval
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; CHECK-LABEL: define double @fcmp_une_maybe_zero(
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; CHECK: %div = fdiv double %x, %z
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}
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