forked from OSchip/llvm-project
243 lines
6.1 KiB
LLVM
243 lines
6.1 KiB
LLVM
; 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: negb %dil
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; CHECK-NEXT: sbbb %al, %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: negw %di
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; CHECK-NEXT: sbbw %ax, %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: negq %rdi
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; CHECK-NEXT: sbbq %rax, %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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%sub = sub i64 0, %ext
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ret i64 %sub
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}
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; (X == 0) ? -1 : 0 --> 0 - (X == 0)
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define i64 @i64_select_neg1_or_0(i64 %x) {
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; CHECK-LABEL: i64_select_neg1_or_0:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpq $1, %rdi
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; CHECK-NEXT: sbbq %rax, %rax
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; CHECK-NEXT: retq
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%cmp = icmp eq i64 %x, 0
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%sel = select i1 %cmp, i64 -1, i64 0
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ret i64 %sel
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}
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; (X == 0) ? -1 : 0 --> 0 - (X == 0)
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define i32 @i32_select_neg1_or_0_as_math(i32 %x) {
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; CHECK-LABEL: i32_select_neg1_or_0_as_math:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpl $1, %edi
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; CHECK-NEXT: sbbl %eax, %eax
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; CHECK-NEXT: retq
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%cmp = icmp eq i32 %x, 0
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%ext = zext i1 %cmp to i32
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%sub = sub i32 0, %ext
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ret i32 %sub
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}
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; (X != 0) ? 0 : -1 --> (X != 0) - 1
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define i16 @i16_select_neg1_or_0_commuted(i16 %x) {
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; CHECK-LABEL: i16_select_neg1_or_0_commuted:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpw $1, %di
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; CHECK-NEXT: sbbw %ax, %ax
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; CHECK-NEXT: retq
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%cmp = icmp ne i16 %x, 0
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%sel = select i1 %cmp, i16 0, i16 -1
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ret i16 %sel
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}
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; (X != 0) ? 0 : -1 --> (X != 0) - 1
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define i8 @i8_select_neg1_or_0_commuted_as_math(i8 %x) {
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; CHECK-LABEL: i8_select_neg1_or_0_commuted_as_math:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpb $1, %dil
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; CHECK-NEXT: sbbb %al, %al
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; CHECK-NEXT: retq
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%cmp = icmp ne i8 %x, 0
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%ext = zext i1 %cmp to i8
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%add = add i8 %ext, -1
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ret i8 %add
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}
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; (X <u Y) ? -1 : 0 --> cmp, sbb
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define i32 @ult_select_neg1_or_0(i32 %x, i32 %y) nounwind {
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; CHECK-LABEL: ult_select_neg1_or_0:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpl %esi, %edi
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; CHECK-NEXT: sbbl %eax, %eax
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; CHECK-NEXT: retq
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%cmp = icmp ult i32 %x, %y
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%ext = sext i1 %cmp to i32
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ret i32 %ext
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}
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; Swap the predicate and compare operands:
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; (Y >u X) ? -1 : 0 --> cmp, sbb
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define i32 @ugt_select_neg1_or_0(i32 %x, i32 %y) nounwind {
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; CHECK-LABEL: ugt_select_neg1_or_0:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpl %esi, %edi
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; CHECK-NEXT: sbbl %eax, %eax
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; CHECK-NEXT: retq
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%cmp = icmp ugt i32 %y, %x
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%ext = sext i1 %cmp to i32
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ret i32 %ext
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}
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; Invert the predicate and effectively swap the select operands:
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; (X >=u Y) ? 0 : -1 --> (X <u Y) ? -1 : 0 --> cmp, sbb
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define i32 @uge_select_0_or_neg1(i32 %x, i32 %y) nounwind {
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; CHECK-LABEL: uge_select_0_or_neg1:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpl %esi, %edi
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; CHECK-NEXT: sbbl %eax, %eax
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; CHECK-NEXT: retq
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%cmp = icmp uge i32 %x, %y
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%ext = zext i1 %cmp to i32
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%add = add i32 %ext, -1
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ret i32 %add
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}
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; Swap the predicate and compare operands:
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; (Y <=u X) ? 0 : -1 --> (X <u Y) ? -1 : 0 --> cmp, sbb
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define i32 @ule_select_0_or_neg1(i32 %x, i32 %y) nounwind {
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; CHECK-LABEL: ule_select_0_or_neg1:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpl %esi, %edi
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; CHECK-NEXT: sbbl %eax, %eax
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; CHECK-NEXT: retq
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%cmp = icmp ule i32 %y, %x
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%ext = zext i1 %cmp to i32
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%add = add i32 %ext, -1
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ret i32 %add
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}
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; Verify that subtract with constant is the same thing.
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; (X >=u Y) ? 0 : -1 --> (X <u Y) ? -1 : 0 --> cmp, sbb
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define i32 @uge_select_0_or_neg1_sub(i32 %x, i32 %y) nounwind {
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; CHECK-LABEL: uge_select_0_or_neg1_sub:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpl %esi, %edi
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; CHECK-NEXT: sbbl %eax, %eax
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; CHECK-NEXT: retq
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%cmp = icmp uge i32 %x, %y
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%ext = zext i1 %cmp to i32
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%sub = sub i32 %ext, 1
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ret i32 %sub
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}
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; Check more sub-from-zero patterns.
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; (X >u Y) ? -1 : 0 --> cmp, sbb
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define i64 @ugt_select_neg1_or_0_sub(i64 %x, i64 %y) nounwind {
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; CHECK-LABEL: ugt_select_neg1_or_0_sub:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpq %rdi, %rsi
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; CHECK-NEXT: sbbq %rax, %rax
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; CHECK-NEXT: retq
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%cmp = icmp ugt i64 %x, %y
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%zext = zext i1 %cmp to i64
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%sub = sub i64 0, %zext
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ret i64 %sub
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}
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; Swap the predicate and compare operands:
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; (Y <u X) ? -1 : 0 --> cmp, sbb
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define i16 @ult_select_neg1_or_0_sub(i16 %x, i16 %y) nounwind {
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; CHECK-LABEL: ult_select_neg1_or_0_sub:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpw %di, %si
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; CHECK-NEXT: sbbw %ax, %ax
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; CHECK-NEXT: retq
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%cmp = icmp ult i16 %y, %x
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%zext = zext i1 %cmp to i16
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%sub = sub i16 0, %zext
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ret i16 %sub
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}
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; Make sure we're creating nodes with the right value types. This would crash.
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; https://bugs.llvm.org/show_bug.cgi?id=33560
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define void @PR33560(i8 %x, i64 %y) {
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; CHECK-LABEL: PR33560:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: negb %dil
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; CHECK-NEXT: sbbq %rax, %rax
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; CHECK-NEXT: cmpq %rsi, %rax
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; CHECK-NEXT: retq
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entry:
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%cmp1 = icmp eq i8 %x, 0
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%ext = zext i1 %cmp1 to i64
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%add = add i64 %ext, -1
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%cmp2 = icmp eq i64 %add, %y
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br i1 %cmp2, label %end, label %else
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else:
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%tmp7 = zext i1 %cmp1 to i8
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br label %end
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end:
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ret void
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}
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