2d5820cd72
This is really a known bits style transformation, but known bits isn't context sensitive. The particular case which comes up happens to involve a range which allows range based reasoning to eliminate the mask pattern, so handle that case specifically in CVP. InstCombine likes to generate the mask-by-low-bits pattern when widening an arithmetic expression which includes a zext in the middle. Differential Revision: https://reviews.llvm.org/D68811 llvm-svn: 374506
128 lines
3.0 KiB
LLVM
128 lines
3.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -correlated-propagation -S | FileCheck %s
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define i32 @test(i32 %a) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP:%.*]] = icmp ult i32 [[A:%.*]], 128
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; CHECK-NEXT: br i1 [[CMP]], label [[CONTINUE:%.*]], label [[EXIT:%.*]]
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; CHECK: continue:
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; CHECK-NEXT: ret i32 [[A]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 -1
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;
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entry:
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%cmp = icmp ult i32 %a, 128
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br i1 %cmp, label %continue, label %exit
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continue:
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%and = and i32 %a, 255
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ret i32 %and
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exit:
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ret i32 -1
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}
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define i32 @test2(i32 %a) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP:%.*]] = icmp ult i32 [[A:%.*]], 256
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; CHECK-NEXT: br i1 [[CMP]], label [[CONTINUE:%.*]], label [[EXIT:%.*]]
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; CHECK: continue:
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; CHECK-NEXT: ret i32 [[A]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 -1
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;
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entry:
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%cmp = icmp ult i32 %a, 256
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br i1 %cmp, label %continue, label %exit
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continue:
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%and = and i32 %a, 255
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ret i32 %and
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exit:
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ret i32 -1
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}
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define i32 @test3(i32 %a) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP:%.*]] = icmp ult i32 [[A:%.*]], 256
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; CHECK-NEXT: br i1 [[CMP]], label [[CONTINUE:%.*]], label [[EXIT:%.*]]
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; CHECK: continue:
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; CHECK-NEXT: ret i32 [[A]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 -1
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;
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entry:
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%cmp = icmp ult i32 %a, 256
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br i1 %cmp, label %continue, label %exit
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continue:
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%and = and i32 %a, 1023
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ret i32 %and
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exit:
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ret i32 -1
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}
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define i32 @neg1(i32 %a) {
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; CHECK-LABEL: @neg1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP:%.*]] = icmp ule i32 [[A:%.*]], 256
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; CHECK-NEXT: br i1 [[CMP]], label [[CONTINUE:%.*]], label [[EXIT:%.*]]
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; CHECK: continue:
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; CHECK-NEXT: [[AND:%.*]] = and i32 [[A]], 255
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; CHECK-NEXT: ret i32 [[AND]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 -1
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;
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entry:
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%cmp = icmp ule i32 %a, 256
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br i1 %cmp, label %continue, label %exit
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continue:
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%and = and i32 %a, 255
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ret i32 %and
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exit:
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ret i32 -1
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}
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define i32 @neg2(i32 %a) {
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; CHECK-LABEL: @neg2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP:%.*]] = icmp ult i32 [[A:%.*]], 513
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; CHECK-NEXT: br i1 [[CMP]], label [[CONTINUE:%.*]], label [[EXIT:%.*]]
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; CHECK: continue:
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; CHECK-NEXT: [[AND:%.*]] = and i32 [[A]], 255
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; CHECK-NEXT: ret i32 [[AND]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 -1
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;
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entry:
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%cmp = icmp ult i32 %a, 513
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br i1 %cmp, label %continue, label %exit
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continue:
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%and = and i32 %a, 255
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ret i32 %and
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exit:
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ret i32 -1
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}
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define i32 @neg3(i32 %a) {
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; CHECK-LABEL: @neg3(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP:%.*]] = icmp ult i32 [[A:%.*]], 256
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; CHECK-NEXT: br i1 [[CMP]], label [[CONTINUE:%.*]], label [[EXIT:%.*]]
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; CHECK: continue:
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; CHECK-NEXT: [[AND:%.*]] = and i32 [[A]], 254
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; CHECK-NEXT: ret i32 [[AND]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 -1
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;
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entry:
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%cmp = icmp ult i32 %a, 256
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br i1 %cmp, label %continue, label %exit
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continue:
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%and = and i32 %a, 254
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ret i32 %and
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exit:
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ret i32 -1
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}
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