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https://github.com/c64scene-ar/llvm-6502.git
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0415b1810b
"(icmp op i8 A, B)" is equivalent to "(icmp op i8 (A & 0xff), B)" as a degenerate case. Allowing this as a "masked" comparison when analysing "(icmp) &/| (icmp)" allows us to combine them in more cases. rdar://problem/7625728 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189931 91177308-0d34-0410-b5e6-96231b3b80d8
153 lines
3.1 KiB
LLVM
153 lines
3.1 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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define i1 @nomask_lhs(i32 %in) {
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; CHECK-LABEL: @nomask_lhs
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; CHECK: [[MASK:%.*]] = and i32 %in, 1
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; CHECK: icmp eq i32 [[MASK]], 0
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; CHECK-NOT: icmp
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; CHECK: ret i1
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%tst1 = icmp eq i32 %in, 0
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%masked = and i32 %in, 1
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%tst2 = icmp eq i32 %masked, 0
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%val = or i1 %tst1, %tst2
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ret i1 %val
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}
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define i1 @nomask_rhs(i32 %in) {
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; CHECK-LABEL: @nomask_rhs
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; CHECK: [[MASK:%.*]] = and i32 %in, 1
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; CHECK: icmp eq i32 [[MASK]], 0
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; CHECK-NOT: icmp
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; CHECK: ret i1
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%masked = and i32 %in, 1
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%tst1 = icmp eq i32 %masked, 0
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%tst2 = icmp eq i32 %in, 0
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%val = or i1 %tst1, %tst2
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ret i1 %val
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}
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