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a8497a77ba
Add DemandedBits / BDCE support for min/max intrinsics: If the low bits are not demanded in the result, they also aren't demanded in the operands. Differential Revision: https://reviews.llvm.org/D87161
84 lines
2.6 KiB
LLVM
84 lines
2.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -bdce < %s | FileCheck %s
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declare i8 @llvm.umax.i8(i8, i8)
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declare i8 @llvm.umin.i8(i8, i8)
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declare i8 @llvm.smax.i8(i8, i8)
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declare i8 @llvm.smin.i8(i8, i8)
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define i8 @umax(i8 %x, i8 %y, i1 %a, i1 %b) {
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; CHECK-LABEL: @umax(
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; CHECK-NEXT: [[A2:%.*]] = zext i1 false to i8
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; CHECK-NEXT: [[B2:%.*]] = zext i1 false to i8
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; CHECK-NEXT: [[X2:%.*]] = or i8 [[X:%.*]], [[A2]]
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; CHECK-NEXT: [[Y2:%.*]] = or i8 [[Y:%.*]], [[B2]]
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; CHECK-NEXT: [[M:%.*]] = call i8 @llvm.umax.i8(i8 [[X2]], i8 [[Y2]])
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; CHECK-NEXT: [[R:%.*]] = lshr i8 [[M]], 1
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; CHECK-NEXT: ret i8 [[R]]
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;
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%a2 = zext i1 %a to i8
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%b2 = zext i1 %b to i8
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%x2 = or i8 %x, %a2
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%y2 = or i8 %y, %b2
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%m = call i8 @llvm.umax.i8(i8 %x2, i8 %y2)
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%r = lshr i8 %m, 1
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ret i8 %r
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}
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define i8 @umin(i8 %x, i8 %y, i1 %a, i1 %b) {
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; CHECK-LABEL: @umin(
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; CHECK-NEXT: [[A2:%.*]] = zext i1 false to i8
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; CHECK-NEXT: [[B2:%.*]] = zext i1 false to i8
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; CHECK-NEXT: [[X2:%.*]] = or i8 [[X:%.*]], [[A2]]
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; CHECK-NEXT: [[Y2:%.*]] = or i8 [[Y:%.*]], [[B2]]
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; CHECK-NEXT: [[M:%.*]] = call i8 @llvm.umin.i8(i8 [[X2]], i8 [[Y2]])
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; CHECK-NEXT: [[R:%.*]] = lshr i8 [[M]], 1
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; CHECK-NEXT: ret i8 [[R]]
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;
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%a2 = zext i1 %a to i8
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%b2 = zext i1 %b to i8
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%x2 = or i8 %x, %a2
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%y2 = or i8 %y, %b2
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%m = call i8 @llvm.umin.i8(i8 %x2, i8 %y2)
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%r = lshr i8 %m, 1
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ret i8 %r
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}
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define i8 @smax(i8 %x, i8 %y, i1 %a, i1 %b) {
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; CHECK-LABEL: @smax(
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; CHECK-NEXT: [[A2:%.*]] = zext i1 false to i8
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; CHECK-NEXT: [[B2:%.*]] = zext i1 false to i8
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; CHECK-NEXT: [[X2:%.*]] = or i8 [[X:%.*]], [[A2]]
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; CHECK-NEXT: [[Y2:%.*]] = or i8 [[Y:%.*]], [[B2]]
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; CHECK-NEXT: [[M:%.*]] = call i8 @llvm.smax.i8(i8 [[X2]], i8 [[Y2]])
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; CHECK-NEXT: [[R:%.*]] = lshr i8 [[M]], 1
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; CHECK-NEXT: ret i8 [[R]]
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;
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%a2 = zext i1 %a to i8
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%b2 = zext i1 %b to i8
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%x2 = or i8 %x, %a2
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%y2 = or i8 %y, %b2
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%m = call i8 @llvm.smax.i8(i8 %x2, i8 %y2)
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%r = lshr i8 %m, 1
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ret i8 %r
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}
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define i8 @smin(i8 %x, i8 %y, i1 %a, i1 %b) {
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; CHECK-LABEL: @smin(
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; CHECK-NEXT: [[A2:%.*]] = zext i1 false to i8
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; CHECK-NEXT: [[B2:%.*]] = zext i1 false to i8
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; CHECK-NEXT: [[X2:%.*]] = or i8 [[X:%.*]], [[A2]]
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; CHECK-NEXT: [[Y2:%.*]] = or i8 [[Y:%.*]], [[B2]]
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; CHECK-NEXT: [[M:%.*]] = call i8 @llvm.smin.i8(i8 [[X2]], i8 [[Y2]])
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; CHECK-NEXT: [[R:%.*]] = lshr i8 [[M]], 1
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; CHECK-NEXT: ret i8 [[R]]
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;
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%a2 = zext i1 %a to i8
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%b2 = zext i1 %b to i8
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%x2 = or i8 %x, %a2
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%y2 = or i8 %y, %b2
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%m = call i8 @llvm.smin.i8(i8 %x2, i8 %y2)
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%r = lshr i8 %m, 1
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ret i8 %r
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}
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