forked from OSchip/llvm-project
63 lines
1.6 KiB
LLVM
63 lines
1.6 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s
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; Vary the operand sizes for extra coverage, but the transform should be identical in all cases.
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; (X == 0) ? 0 : -1 --> (X == 0) - 1
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define i8 @i8_select_0_or_neg1(i8 %x) {
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; CHECK-LABEL: i8_select_0_or_neg1:
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; CHECK: # BB#0:
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; CHECK-NEXT: cmpb $1, %dil
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; CHECK-NEXT: movb $-1, %al
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; CHECK-NEXT: adcb $0, %al
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; CHECK-NEXT: retq
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%cmp = icmp eq i8 %x, 0
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%sel = select i1 %cmp, i8 0, i8 -1
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ret i8 %sel
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}
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; (X == 0) ? 0 : -1 --> (X == 0) - 1
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define i16 @i16_select_0_or_neg1_as_math(i16 %x) {
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; CHECK-LABEL: i16_select_0_or_neg1_as_math:
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; CHECK: # BB#0:
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; CHECK-NEXT: cmpw $1, %di
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; CHECK-NEXT: movw $-1, %ax
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; CHECK-NEXT: adcw $0, %ax
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; CHECK-NEXT: retq
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%cmp = icmp eq i16 %x, 0
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%ext = zext i1 %cmp to i16
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%add = add i16 %ext, -1
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ret i16 %add
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}
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; (X !== 0) ? -1 : 0 --> 0 - (X != 0)
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define i32 @i32_select_0_or_neg1_commuted(i32 %x) {
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; CHECK-LABEL: i32_select_0_or_neg1_commuted:
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; CHECK: # BB#0:
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; CHECK-NEXT: negl %edi
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; CHECK-NEXT: sbbl %eax, %eax
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; CHECK-NEXT: retq
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%cmp = icmp ne i32 %x, 0
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%sel = select i1 %cmp, i32 -1, i32 0
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ret i32 %sel
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}
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; (X !== 0) ? -1 : 0 --> 0 - (X != 0)
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define i64 @i64_select_0_or_neg1_commuted_as_math(i64 %x) {
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; CHECK-LABEL: i64_select_0_or_neg1_commuted_as_math:
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; CHECK: # BB#0:
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: cmpq $1, %rdi
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; CHECK-NEXT: adcq $-1, %rax
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; CHECK-NEXT: retq
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%cmp = icmp ne i64 %x, 0
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%ext = zext i1 %cmp to i64
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%add = sub i64 0, %ext
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ret i64 %add
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}
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