a105877646
The idea behind this canonicalization is that it allows us to handle less patterns, because we know that some will be canonicalized away. This is indeed very useful to e.g. know that constants are always on the right. However, this is only useful if the canonicalization is actually reliable. This is the case for constants, but not for arguments: Moving these to the right makes it look like the "more complex" expression is guaranteed to be on the left, but this is not actually the case in practice. It fails as soon as you replace the argument with another instruction. The end result is that it looks like things correctly work in tests, while they actually don't. We use the "thwart complexity-based canonicalization" trick to handle this in tests, but it's often a challenge for new contributors to get this right, and based on the regressions this PR originally exposed, we clearly don't get this right in many cases. For this reason, I think that it's better to remove this complexity canonicalization. It will make it much easier to write tests for commuted cases and make sure that they are handled.
433 lines
16 KiB
LLVM
433 lines
16 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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define i16 @narrow_sext_and(i16 %x16, i32 %y32) {
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; CHECK-LABEL: define i16 @narrow_sext_and(
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; CHECK-SAME: i16 [[X16:%.*]], i32 [[Y32:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[Y32]] to i16
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; CHECK-NEXT: [[R:%.*]] = and i16 [[X16]], [[TMP1]]
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; CHECK-NEXT: ret i16 [[R]]
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;
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%x32 = sext i16 %x16 to i32
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%b = and i32 %x32, %y32
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%r = trunc i32 %b to i16
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ret i16 %r
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}
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define i16 @narrow_zext_and(i16 %x16, i32 %y32) {
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; CHECK-LABEL: define i16 @narrow_zext_and(
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; CHECK-SAME: i16 [[X16:%.*]], i32 [[Y32:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[Y32]] to i16
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; CHECK-NEXT: [[R:%.*]] = and i16 [[X16]], [[TMP1]]
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; CHECK-NEXT: ret i16 [[R]]
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;
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%x32 = zext i16 %x16 to i32
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%b = and i32 %x32, %y32
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%r = trunc i32 %b to i16
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ret i16 %r
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}
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define i16 @narrow_sext_or(i16 %x16, i32 %y32) {
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; CHECK-LABEL: define i16 @narrow_sext_or(
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; CHECK-SAME: i16 [[X16:%.*]], i32 [[Y32:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[Y32]] to i16
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; CHECK-NEXT: [[R:%.*]] = or i16 [[X16]], [[TMP1]]
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; CHECK-NEXT: ret i16 [[R]]
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;
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%x32 = sext i16 %x16 to i32
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%b = or i32 %x32, %y32
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%r = trunc i32 %b to i16
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ret i16 %r
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}
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define i16 @narrow_zext_or(i16 %x16, i32 %y32) {
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; CHECK-LABEL: define i16 @narrow_zext_or(
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; CHECK-SAME: i16 [[X16:%.*]], i32 [[Y32:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[Y32]] to i16
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; CHECK-NEXT: [[R:%.*]] = or i16 [[X16]], [[TMP1]]
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; CHECK-NEXT: ret i16 [[R]]
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;
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%x32 = zext i16 %x16 to i32
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%b = or i32 %x32, %y32
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%r = trunc i32 %b to i16
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ret i16 %r
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}
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define i16 @narrow_sext_xor(i16 %x16, i32 %y32) {
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; CHECK-LABEL: define i16 @narrow_sext_xor(
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; CHECK-SAME: i16 [[X16:%.*]], i32 [[Y32:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[Y32]] to i16
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; CHECK-NEXT: [[R:%.*]] = xor i16 [[X16]], [[TMP1]]
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; CHECK-NEXT: ret i16 [[R]]
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;
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%x32 = sext i16 %x16 to i32
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%b = xor i32 %x32, %y32
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%r = trunc i32 %b to i16
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ret i16 %r
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}
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define i16 @narrow_zext_xor(i16 %x16, i32 %y32) {
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; CHECK-LABEL: define i16 @narrow_zext_xor(
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; CHECK-SAME: i16 [[X16:%.*]], i32 [[Y32:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[Y32]] to i16
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; CHECK-NEXT: [[R:%.*]] = xor i16 [[X16]], [[TMP1]]
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; CHECK-NEXT: ret i16 [[R]]
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;
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%x32 = zext i16 %x16 to i32
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%b = xor i32 %x32, %y32
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%r = trunc i32 %b to i16
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ret i16 %r
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}
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define i16 @narrow_sext_add(i16 %x16, i32 %y32) {
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; CHECK-LABEL: define i16 @narrow_sext_add(
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; CHECK-SAME: i16 [[X16:%.*]], i32 [[Y32:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[Y32]] to i16
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; CHECK-NEXT: [[R:%.*]] = add i16 [[X16]], [[TMP1]]
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; CHECK-NEXT: ret i16 [[R]]
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;
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%x32 = sext i16 %x16 to i32
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%b = add i32 %x32, %y32
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%r = trunc i32 %b to i16
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ret i16 %r
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}
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define i16 @narrow_zext_add(i16 %x16, i32 %y32) {
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; CHECK-LABEL: define i16 @narrow_zext_add(
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; CHECK-SAME: i16 [[X16:%.*]], i32 [[Y32:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[Y32]] to i16
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; CHECK-NEXT: [[R:%.*]] = add i16 [[X16]], [[TMP1]]
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; CHECK-NEXT: ret i16 [[R]]
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;
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%x32 = zext i16 %x16 to i32
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%b = add i32 %x32, %y32
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%r = trunc i32 %b to i16
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ret i16 %r
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}
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define i16 @narrow_sext_sub(i16 %x16, i32 %y32) {
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; CHECK-LABEL: define i16 @narrow_sext_sub(
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; CHECK-SAME: i16 [[X16:%.*]], i32 [[Y32:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[Y32]] to i16
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; CHECK-NEXT: [[R:%.*]] = sub i16 [[X16]], [[TMP1]]
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; CHECK-NEXT: ret i16 [[R]]
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;
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%x32 = sext i16 %x16 to i32
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%b = sub i32 %x32, %y32
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%r = trunc i32 %b to i16
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ret i16 %r
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}
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define i16 @narrow_zext_sub(i16 %x16, i32 %y32) {
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; CHECK-LABEL: define i16 @narrow_zext_sub(
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; CHECK-SAME: i16 [[X16:%.*]], i32 [[Y32:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[Y32]] to i16
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; CHECK-NEXT: [[R:%.*]] = sub i16 [[X16]], [[TMP1]]
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; CHECK-NEXT: ret i16 [[R]]
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;
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%x32 = zext i16 %x16 to i32
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%b = sub i32 %x32, %y32
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%r = trunc i32 %b to i16
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ret i16 %r
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}
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define i16 @narrow_sext_mul(i16 %x16, i32 %y32) {
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; CHECK-LABEL: define i16 @narrow_sext_mul(
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; CHECK-SAME: i16 [[X16:%.*]], i32 [[Y32:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[Y32]] to i16
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; CHECK-NEXT: [[R:%.*]] = mul i16 [[X16]], [[TMP1]]
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; CHECK-NEXT: ret i16 [[R]]
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;
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%x32 = sext i16 %x16 to i32
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%b = mul i32 %x32, %y32
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%r = trunc i32 %b to i16
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ret i16 %r
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}
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define i16 @narrow_zext_mul(i16 %x16, i32 %y32) {
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; CHECK-LABEL: define i16 @narrow_zext_mul(
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; CHECK-SAME: i16 [[X16:%.*]], i32 [[Y32:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[Y32]] to i16
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; CHECK-NEXT: [[R:%.*]] = mul i16 [[X16]], [[TMP1]]
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; CHECK-NEXT: ret i16 [[R]]
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;
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%x32 = zext i16 %x16 to i32
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%b = mul i32 %x32, %y32
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%r = trunc i32 %b to i16
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ret i16 %r
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}
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; Verify that the commuted patterns work. The div is to ensure that complexity-based
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; canonicalization doesn't swap the binop operands. Use vector types to show those work too.
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define <2 x i16> @narrow_sext_and_commute(<2 x i16> %x16, <2 x i32> %y32) {
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; CHECK-LABEL: define <2 x i16> @narrow_sext_and_commute(
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; CHECK-SAME: <2 x i16> [[X16:%.*]], <2 x i32> [[Y32:%.*]]) {
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; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> [[Y32]], <i32 7, i32 -17>
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; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
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; CHECK-NEXT: [[R:%.*]] = and <2 x i16> [[X16]], [[TMP1]]
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; CHECK-NEXT: ret <2 x i16> [[R]]
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;
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%y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
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%x32 = sext <2 x i16> %x16 to <2 x i32>
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%b = and <2 x i32> %y32op0, %x32
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%r = trunc <2 x i32> %b to <2 x i16>
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ret <2 x i16> %r
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}
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define <2 x i16> @narrow_zext_and_commute(<2 x i16> %x16, <2 x i32> %y32) {
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; CHECK-LABEL: define <2 x i16> @narrow_zext_and_commute(
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; CHECK-SAME: <2 x i16> [[X16:%.*]], <2 x i32> [[Y32:%.*]]) {
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; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> [[Y32]], <i32 7, i32 -17>
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; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
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; CHECK-NEXT: [[R:%.*]] = and <2 x i16> [[X16]], [[TMP1]]
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; CHECK-NEXT: ret <2 x i16> [[R]]
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;
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%y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
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%x32 = zext <2 x i16> %x16 to <2 x i32>
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%b = and <2 x i32> %y32op0, %x32
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%r = trunc <2 x i32> %b to <2 x i16>
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ret <2 x i16> %r
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}
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define <2 x i16> @narrow_sext_or_commute(<2 x i16> %x16, <2 x i32> %y32) {
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; CHECK-LABEL: define <2 x i16> @narrow_sext_or_commute(
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; CHECK-SAME: <2 x i16> [[X16:%.*]], <2 x i32> [[Y32:%.*]]) {
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; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> [[Y32]], <i32 7, i32 -17>
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; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
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; CHECK-NEXT: [[R:%.*]] = or <2 x i16> [[X16]], [[TMP1]]
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; CHECK-NEXT: ret <2 x i16> [[R]]
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;
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%y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
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%x32 = sext <2 x i16> %x16 to <2 x i32>
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%b = or <2 x i32> %y32op0, %x32
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%r = trunc <2 x i32> %b to <2 x i16>
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ret <2 x i16> %r
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}
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define <2 x i16> @narrow_zext_or_commute(<2 x i16> %x16, <2 x i32> %y32) {
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; CHECK-LABEL: define <2 x i16> @narrow_zext_or_commute(
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; CHECK-SAME: <2 x i16> [[X16:%.*]], <2 x i32> [[Y32:%.*]]) {
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; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> [[Y32]], <i32 7, i32 -17>
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; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
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; CHECK-NEXT: [[R:%.*]] = or <2 x i16> [[X16]], [[TMP1]]
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; CHECK-NEXT: ret <2 x i16> [[R]]
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;
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%y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
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%x32 = zext <2 x i16> %x16 to <2 x i32>
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%b = or <2 x i32> %y32op0, %x32
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%r = trunc <2 x i32> %b to <2 x i16>
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ret <2 x i16> %r
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}
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define <2 x i16> @narrow_sext_xor_commute(<2 x i16> %x16, <2 x i32> %y32) {
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; CHECK-LABEL: define <2 x i16> @narrow_sext_xor_commute(
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; CHECK-SAME: <2 x i16> [[X16:%.*]], <2 x i32> [[Y32:%.*]]) {
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; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> [[Y32]], <i32 7, i32 -17>
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; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
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; CHECK-NEXT: [[R:%.*]] = xor <2 x i16> [[X16]], [[TMP1]]
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; CHECK-NEXT: ret <2 x i16> [[R]]
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;
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%y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
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%x32 = sext <2 x i16> %x16 to <2 x i32>
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%b = xor <2 x i32> %y32op0, %x32
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%r = trunc <2 x i32> %b to <2 x i16>
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ret <2 x i16> %r
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}
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define <2 x i16> @narrow_zext_xor_commute(<2 x i16> %x16, <2 x i32> %y32) {
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; CHECK-LABEL: define <2 x i16> @narrow_zext_xor_commute(
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; CHECK-SAME: <2 x i16> [[X16:%.*]], <2 x i32> [[Y32:%.*]]) {
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; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> [[Y32]], <i32 7, i32 -17>
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; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
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; CHECK-NEXT: [[R:%.*]] = xor <2 x i16> [[X16]], [[TMP1]]
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; CHECK-NEXT: ret <2 x i16> [[R]]
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;
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%y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
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%x32 = zext <2 x i16> %x16 to <2 x i32>
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%b = xor <2 x i32> %y32op0, %x32
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%r = trunc <2 x i32> %b to <2 x i16>
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ret <2 x i16> %r
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}
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define <2 x i16> @narrow_sext_add_commute(<2 x i16> %x16, <2 x i32> %y32) {
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; CHECK-LABEL: define <2 x i16> @narrow_sext_add_commute(
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; CHECK-SAME: <2 x i16> [[X16:%.*]], <2 x i32> [[Y32:%.*]]) {
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; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> [[Y32]], <i32 7, i32 -17>
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; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
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; CHECK-NEXT: [[R:%.*]] = add <2 x i16> [[X16]], [[TMP1]]
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; CHECK-NEXT: ret <2 x i16> [[R]]
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;
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%y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
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%x32 = sext <2 x i16> %x16 to <2 x i32>
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%b = add <2 x i32> %y32op0, %x32
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%r = trunc <2 x i32> %b to <2 x i16>
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ret <2 x i16> %r
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}
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define <2 x i16> @narrow_zext_add_commute(<2 x i16> %x16, <2 x i32> %y32) {
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; CHECK-LABEL: define <2 x i16> @narrow_zext_add_commute(
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; CHECK-SAME: <2 x i16> [[X16:%.*]], <2 x i32> [[Y32:%.*]]) {
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; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> [[Y32]], <i32 7, i32 -17>
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; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
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; CHECK-NEXT: [[R:%.*]] = add <2 x i16> [[X16]], [[TMP1]]
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; CHECK-NEXT: ret <2 x i16> [[R]]
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;
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%y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
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%x32 = zext <2 x i16> %x16 to <2 x i32>
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%b = add <2 x i32> %y32op0, %x32
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%r = trunc <2 x i32> %b to <2 x i16>
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ret <2 x i16> %r
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}
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define <2 x i16> @narrow_sext_sub_commute(<2 x i16> %x16, <2 x i32> %y32) {
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; CHECK-LABEL: define <2 x i16> @narrow_sext_sub_commute(
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; CHECK-SAME: <2 x i16> [[X16:%.*]], <2 x i32> [[Y32:%.*]]) {
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; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> [[Y32]], <i32 7, i32 -17>
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; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
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; CHECK-NEXT: [[R:%.*]] = sub <2 x i16> [[TMP1]], [[X16]]
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; CHECK-NEXT: ret <2 x i16> [[R]]
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;
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%y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
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%x32 = sext <2 x i16> %x16 to <2 x i32>
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%b = sub <2 x i32> %y32op0, %x32
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%r = trunc <2 x i32> %b to <2 x i16>
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ret <2 x i16> %r
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}
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define <2 x i16> @narrow_zext_sub_commute(<2 x i16> %x16, <2 x i32> %y32) {
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; CHECK-LABEL: define <2 x i16> @narrow_zext_sub_commute(
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; CHECK-SAME: <2 x i16> [[X16:%.*]], <2 x i32> [[Y32:%.*]]) {
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; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> [[Y32]], <i32 7, i32 -17>
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; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
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; CHECK-NEXT: [[R:%.*]] = sub <2 x i16> [[TMP1]], [[X16]]
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; CHECK-NEXT: ret <2 x i16> [[R]]
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;
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%y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
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%x32 = zext <2 x i16> %x16 to <2 x i32>
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%b = sub <2 x i32> %y32op0, %x32
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%r = trunc <2 x i32> %b to <2 x i16>
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ret <2 x i16> %r
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}
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define <2 x i16> @narrow_sext_mul_commute(<2 x i16> %x16, <2 x i32> %y32) {
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; CHECK-LABEL: define <2 x i16> @narrow_sext_mul_commute(
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; CHECK-SAME: <2 x i16> [[X16:%.*]], <2 x i32> [[Y32:%.*]]) {
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; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> [[Y32]], <i32 7, i32 -17>
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; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
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; CHECK-NEXT: [[R:%.*]] = mul <2 x i16> [[X16]], [[TMP1]]
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; CHECK-NEXT: ret <2 x i16> [[R]]
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;
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%y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
|
|
%x32 = sext <2 x i16> %x16 to <2 x i32>
|
|
%b = mul <2 x i32> %y32op0, %x32
|
|
%r = trunc <2 x i32> %b to <2 x i16>
|
|
ret <2 x i16> %r
|
|
}
|
|
|
|
define <2 x i16> @narrow_zext_mul_commute(<2 x i16> %x16, <2 x i32> %y32) {
|
|
; CHECK-LABEL: define <2 x i16> @narrow_zext_mul_commute(
|
|
; CHECK-SAME: <2 x i16> [[X16:%.*]], <2 x i32> [[Y32:%.*]]) {
|
|
; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> [[Y32]], <i32 7, i32 -17>
|
|
; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
|
|
; CHECK-NEXT: [[R:%.*]] = mul <2 x i16> [[X16]], [[TMP1]]
|
|
; CHECK-NEXT: ret <2 x i16> [[R]]
|
|
;
|
|
%y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
|
|
%x32 = zext <2 x i16> %x16 to <2 x i32>
|
|
%b = mul <2 x i32> %y32op0, %x32
|
|
%r = trunc <2 x i32> %b to <2 x i16>
|
|
ret <2 x i16> %r
|
|
}
|
|
|
|
; Test cases for PR43580
|
|
define i8 @narrow_zext_ashr_keep_trunc(i8 %i1, i8 %i2) {
|
|
; CHECK-LABEL: define i8 @narrow_zext_ashr_keep_trunc(
|
|
; CHECK-SAME: i8 [[I1:%.*]], i8 [[I2:%.*]]) {
|
|
; CHECK-NEXT: [[I1_EXT:%.*]] = sext i8 [[I1]] to i16
|
|
; CHECK-NEXT: [[I2_EXT:%.*]] = sext i8 [[I2]] to i16
|
|
; CHECK-NEXT: [[SUB:%.*]] = add nsw i16 [[I1_EXT]], [[I2_EXT]]
|
|
; CHECK-NEXT: [[SHIFT:%.*]] = lshr i16 [[SUB]], 1
|
|
; CHECK-NEXT: [[T:%.*]] = trunc i16 [[SHIFT]] to i8
|
|
; CHECK-NEXT: ret i8 [[T]]
|
|
;
|
|
%i1.ext = sext i8 %i1 to i32
|
|
%i2.ext = sext i8 %i2 to i32
|
|
%sub = add nsw i32 %i1.ext, %i2.ext
|
|
%shift = ashr i32 %sub, 1
|
|
%t = trunc i32 %shift to i8
|
|
ret i8 %t
|
|
}
|
|
|
|
define i8 @narrow_zext_ashr_keep_trunc2(i9 %i1, i9 %i2) {
|
|
; CHECK-LABEL: define i8 @narrow_zext_ashr_keep_trunc2(
|
|
; CHECK-SAME: i9 [[I1:%.*]], i9 [[I2:%.*]]) {
|
|
; CHECK-NEXT: [[I1_EXT:%.*]] = zext i9 [[I1]] to i16
|
|
; CHECK-NEXT: [[I2_EXT:%.*]] = zext i9 [[I2]] to i16
|
|
; CHECK-NEXT: [[SUB:%.*]] = add nuw nsw i16 [[I1_EXT]], [[I2_EXT]]
|
|
; CHECK-NEXT: [[SHIFT:%.*]] = lshr i16 [[SUB]], 1
|
|
; CHECK-NEXT: [[T:%.*]] = trunc i16 [[SHIFT]] to i8
|
|
; CHECK-NEXT: ret i8 [[T]]
|
|
;
|
|
%i1.ext = sext i9 %i1 to i64
|
|
%i2.ext = sext i9 %i2 to i64
|
|
%sub = add nsw i64 %i1.ext, %i2.ext
|
|
%shift = ashr i64 %sub, 1
|
|
%t = trunc i64 %shift to i8
|
|
ret i8 %t
|
|
}
|
|
|
|
define i7 @narrow_zext_ashr_keep_trunc3(i8 %i1, i8 %i2) {
|
|
; CHECK-LABEL: define i7 @narrow_zext_ashr_keep_trunc3(
|
|
; CHECK-SAME: i8 [[I1:%.*]], i8 [[I2:%.*]]) {
|
|
; CHECK-NEXT: [[I1_EXT:%.*]] = zext i8 [[I1]] to i14
|
|
; CHECK-NEXT: [[I2_EXT:%.*]] = zext i8 [[I2]] to i14
|
|
; CHECK-NEXT: [[SUB:%.*]] = add nuw nsw i14 [[I1_EXT]], [[I2_EXT]]
|
|
; CHECK-NEXT: [[SHIFT:%.*]] = lshr i14 [[SUB]], 1
|
|
; CHECK-NEXT: [[T:%.*]] = trunc i14 [[SHIFT]] to i7
|
|
; CHECK-NEXT: ret i7 [[T]]
|
|
;
|
|
%i1.ext = sext i8 %i1 to i64
|
|
%i2.ext = sext i8 %i2 to i64
|
|
%sub = add nsw i64 %i1.ext, %i2.ext
|
|
%shift = ashr i64 %sub, 1
|
|
%t = trunc i64 %shift to i7
|
|
ret i7 %t
|
|
}
|
|
|
|
define <8 x i8> @narrow_zext_ashr_keep_trunc_vector(<8 x i8> %i1, <8 x i8> %i2) {
|
|
; CHECK-LABEL: define <8 x i8> @narrow_zext_ashr_keep_trunc_vector(
|
|
; CHECK-SAME: <8 x i8> [[I1:%.*]], <8 x i8> [[I2:%.*]]) {
|
|
; CHECK-NEXT: [[I1_EXT:%.*]] = sext <8 x i8> [[I1]] to <8 x i32>
|
|
; CHECK-NEXT: [[I2_EXT:%.*]] = sext <8 x i8> [[I2]] to <8 x i32>
|
|
; CHECK-NEXT: [[SUB:%.*]] = add nsw <8 x i32> [[I1_EXT]], [[I2_EXT]]
|
|
; CHECK-NEXT: [[SHIFT:%.*]] = lshr <8 x i32> [[SUB]], <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
|
|
; CHECK-NEXT: [[T:%.*]] = trunc <8 x i32> [[SHIFT]] to <8 x i8>
|
|
; CHECK-NEXT: ret <8 x i8> [[T]]
|
|
;
|
|
%i1.ext = sext <8 x i8> %i1 to <8 x i32>
|
|
%i2.ext = sext <8 x i8> %i2 to <8 x i32>
|
|
%sub = add nsw <8 x i32> %i1.ext, %i2.ext
|
|
%shift = ashr <8 x i32> %sub, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
|
|
%t = trunc <8 x i32> %shift to <8 x i8>
|
|
ret <8 x i8> %t
|
|
}
|
|
|
|
define i8 @dont_narrow_zext_ashr_keep_trunc(i8 %i1, i8 %i2) {
|
|
; CHECK-LABEL: define i8 @dont_narrow_zext_ashr_keep_trunc(
|
|
; CHECK-SAME: i8 [[I1:%.*]], i8 [[I2:%.*]]) {
|
|
; CHECK-NEXT: [[I1_EXT:%.*]] = sext i8 [[I1]] to i16
|
|
; CHECK-NEXT: [[I2_EXT:%.*]] = sext i8 [[I2]] to i16
|
|
; CHECK-NEXT: [[SUB:%.*]] = add nsw i16 [[I1_EXT]], [[I2_EXT]]
|
|
; CHECK-NEXT: [[SHIFT:%.*]] = lshr i16 [[SUB]], 1
|
|
; CHECK-NEXT: [[T:%.*]] = trunc i16 [[SHIFT]] to i8
|
|
; CHECK-NEXT: ret i8 [[T]]
|
|
;
|
|
%i1.ext = sext i8 %i1 to i16
|
|
%i2.ext = sext i8 %i2 to i16
|
|
%sub = add nsw i16 %i1.ext, %i2.ext
|
|
%shift = ashr i16 %sub, 1
|
|
%t = trunc i16 %shift to i8
|
|
ret i8 %t
|
|
}
|