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Even in cases which aren't universally optimisable like "(A & B) != 0 && (A & C) != 0", the masks can make one of the comparisons completely redundant. In this case, since we've gone to the effort of spotting masked comparisons we should combine them. rdar://problem/7625728 llvm-svn: 189930
123 lines
2.5 KiB
LLVM
123 lines
2.5 KiB
LLVM
; RUN: opt -instcombine -S -o - %s | FileCheck %s
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define i1 @masked_and_notallzeroes(i32 %A) {
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; CHECK-LABEL: @masked_and_notallzeroes
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; CHECK: [[MASK:%.*]] = and i32 %A, 7
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; CHECK: icmp ne i32 [[MASK]], 0
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; CHECK-NOT: and i32 %A, 39
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; CHECK: ret i1
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%mask1 = and i32 %A, 7
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%tst1 = icmp ne i32 %mask1, 0
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%mask2 = and i32 %A, 39
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%tst2 = icmp ne i32 %mask2, 0
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%res = and i1 %tst1, %tst2
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ret i1 %res
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}
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define i1 @masked_or_allzeroes(i32 %A) {
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; CHECK-LABEL: @masked_or_allzeroes
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; CHECK: [[MASK:%.*]] = and i32 %A, 7
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; CHECK: icmp eq i32 [[MASK]], 0
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; CHECK-NOT: and i32 %A, 39
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; CHECK: ret i1
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%mask1 = and i32 %A, 7
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%tst1 = icmp eq i32 %mask1, 0
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%mask2 = and i32 %A, 39
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%tst2 = icmp eq i32 %mask2, 0
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%res = or i1 %tst1, %tst2
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ret i1 %res
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}
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define i1 @masked_and_notallones(i32 %A) {
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; CHECK-LABEL: @masked_and_notallones
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; CHECK: [[MASK:%.*]] = and i32 %A, 7
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; CHECK: icmp ne i32 [[MASK]], 7
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; CHECK-NOT: and i32 %A, 39
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; CHECK: ret i1
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%mask1 = and i32 %A, 7
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%tst1 = icmp ne i32 %mask1, 7
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%mask2 = and i32 %A, 39
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%tst2 = icmp ne i32 %mask2, 39
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%res = and i1 %tst1, %tst2
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ret i1 %res
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}
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define i1 @masked_or_allones(i32 %A) {
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; CHECK-LABEL: @masked_or_allones
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; CHECK: [[MASK:%.*]] = and i32 %A, 7
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; CHECK: icmp eq i32 [[MASK]], 7
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; CHECK-NOT: and i32 %A, 39
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; CHECK: ret i1
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%mask1 = and i32 %A, 7
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%tst1 = icmp eq i32 %mask1, 7
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%mask2 = and i32 %A, 39
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%tst2 = icmp eq i32 %mask2, 39
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%res = or i1 %tst1, %tst2
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ret i1 %res
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}
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define i1 @masked_and_notA(i32 %A) {
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; CHECK-LABEL: @masked_and_notA
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; CHECK: [[MASK:%.*]] = and i32 %A, 39
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; CHECK: icmp ne i32 [[MASK]], %A
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; CHECK-NOT: and i32 %A, 7
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; CHECK: ret i1
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%mask1 = and i32 %A, 7
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%tst1 = icmp ne i32 %mask1, %A
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%mask2 = and i32 %A, 39
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%tst2 = icmp ne i32 %mask2, %A
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%res = and i1 %tst1, %tst2
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ret i1 %res
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}
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define i1 @masked_or_A(i32 %A) {
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; CHECK-LABEL: @masked_or_A
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; CHECK: [[MASK:%.*]] = and i32 %A, 39
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; CHECK: icmp eq i32 [[MASK]], %A
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; CHECK-NOT: and i32 %A, 7
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; CHECK: ret i1
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%mask1 = and i32 %A, 7
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%tst1 = icmp eq i32 %mask1, %A
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%mask2 = and i32 %A, 39
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%tst2 = icmp eq i32 %mask2, %A
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%res = or i1 %tst1, %tst2
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ret i1 %res
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}
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define i1 @masked_or_allzeroes_notoptimised(i32 %A) {
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; CHECK-LABEL: @masked_or_allzeroes_notoptimised
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; CHECK: [[MASK:%.*]] = and i32 %A, 15
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; CHECK: icmp eq i32 [[MASK]], 0
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; CHECK: [[MASK:%.*]] = and i32 %A, 39
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; CHECK: icmp eq i32 [[MASK]], 0
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; CHECK: ret i1
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%mask1 = and i32 %A, 15
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%tst1 = icmp eq i32 %mask1, 0
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%mask2 = and i32 %A, 39
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%tst2 = icmp eq i32 %mask2, 0
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%res = or i1 %tst1, %tst2
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ret i1 %res
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}
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