e094abde42
The previous expansion of [US]CMP was done using two selects and two compares. It produced decent code, but on many platforms it is better to implement [US]CMP nodes by performing the following operation: ``` [us]cmp(x, y) = (x [us]> y) - (x [us]< y) ``` This patch adds this new expansion, as well as a hook in TargetLowering to allow some targets to still use the select-based approach. AArch64 and SystemZ are currently the only targets to prefer the former approach, but other targets may also start to use it if it provides for better codegen.
125 lines
3.3 KiB
LLVM
125 lines
3.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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; RUN: llc -mtriple=ppc64le-unknown-unknown %s -o - | FileCheck %s
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define i8 @ucmp_8_8(i8 zeroext %x, i8 zeroext %y) nounwind {
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; CHECK-LABEL: ucmp_8_8:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmplw 3, 4
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; CHECK-NEXT: sub 5, 4, 3
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; CHECK-NEXT: li 3, -1
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; CHECK-NEXT: rldicl 5, 5, 1, 63
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; CHECK-NEXT: rldic 3, 3, 0, 32
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; CHECK-NEXT: isellt 3, 3, 5
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; CHECK-NEXT: blr
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%1 = call i8 @llvm.ucmp(i8 %x, i8 %y)
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ret i8 %1
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}
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define i8 @ucmp_8_16(i16 zeroext %x, i16 zeroext %y) nounwind {
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; CHECK-LABEL: ucmp_8_16:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmplw 3, 4
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; CHECK-NEXT: sub 5, 4, 3
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; CHECK-NEXT: li 3, -1
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; CHECK-NEXT: rldicl 5, 5, 1, 63
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; CHECK-NEXT: rldic 3, 3, 0, 32
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; CHECK-NEXT: isellt 3, 3, 5
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; CHECK-NEXT: blr
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%1 = call i8 @llvm.ucmp(i16 %x, i16 %y)
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ret i8 %1
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}
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define i8 @ucmp_8_32(i32 %x, i32 %y) nounwind {
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; CHECK-LABEL: ucmp_8_32:
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; CHECK: # %bb.0:
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; CHECK-NEXT: clrldi 5, 4, 32
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; CHECK-NEXT: clrldi 6, 3, 32
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; CHECK-NEXT: sub 5, 5, 6
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; CHECK-NEXT: cmplw 3, 4
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; CHECK-NEXT: li 3, -1
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; CHECK-NEXT: rldic 3, 3, 0, 32
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; CHECK-NEXT: rldicl 5, 5, 1, 63
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; CHECK-NEXT: isellt 3, 3, 5
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; CHECK-NEXT: blr
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%1 = call i8 @llvm.ucmp(i32 %x, i32 %y)
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ret i8 %1
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}
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define i8 @ucmp_8_64(i64 %x, i64 %y) nounwind {
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; CHECK-LABEL: ucmp_8_64:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpld 3, 4
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; CHECK-NEXT: subc 3, 4, 3
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; CHECK-NEXT: subfe 3, 4, 4
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; CHECK-NEXT: li 4, -1
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; CHECK-NEXT: neg 3, 3
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; CHECK-NEXT: isellt 3, 4, 3
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; CHECK-NEXT: blr
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%1 = call i8 @llvm.ucmp(i64 %x, i64 %y)
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ret i8 %1
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}
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define i8 @ucmp_8_128(i128 %x, i128 %y) nounwind {
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; CHECK-LABEL: ucmp_8_128:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpld 4, 6
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; CHECK-NEXT: cmpld 1, 3, 5
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; CHECK-NEXT: li 3, 1
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; CHECK-NEXT: li 4, -1
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; CHECK-NEXT: crandc 20, 1, 2
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; CHECK-NEXT: crand 21, 2, 5
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; CHECK-NEXT: crnor 20, 21, 20
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; CHECK-NEXT: crand 21, 2, 4
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; CHECK-NEXT: isel 3, 0, 3, 20
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; CHECK-NEXT: crandc 20, 0, 2
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; CHECK-NEXT: cror 20, 21, 20
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; CHECK-NEXT: isel 3, 4, 3, 20
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; CHECK-NEXT: blr
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%1 = call i8 @llvm.ucmp(i128 %x, i128 %y)
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ret i8 %1
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}
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define i32 @ucmp_32_32(i32 %x, i32 %y) nounwind {
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; CHECK-LABEL: ucmp_32_32:
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; CHECK: # %bb.0:
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; CHECK-NEXT: clrldi 5, 4, 32
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; CHECK-NEXT: clrldi 6, 3, 32
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; CHECK-NEXT: sub 5, 5, 6
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; CHECK-NEXT: cmplw 3, 4
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; CHECK-NEXT: li 3, -1
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; CHECK-NEXT: rldic 3, 3, 0, 32
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; CHECK-NEXT: rldicl 5, 5, 1, 63
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; CHECK-NEXT: isellt 3, 3, 5
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; CHECK-NEXT: blr
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%1 = call i32 @llvm.ucmp(i32 %x, i32 %y)
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ret i32 %1
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}
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define i32 @ucmp_32_64(i64 %x, i64 %y) nounwind {
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; CHECK-LABEL: ucmp_32_64:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpld 3, 4
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; CHECK-NEXT: subc 3, 4, 3
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; CHECK-NEXT: subfe 3, 4, 4
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; CHECK-NEXT: li 4, -1
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; CHECK-NEXT: neg 3, 3
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; CHECK-NEXT: isellt 3, 4, 3
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; CHECK-NEXT: blr
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%1 = call i32 @llvm.ucmp(i64 %x, i64 %y)
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ret i32 %1
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}
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define i64 @ucmp_64_64(i64 %x, i64 %y) nounwind {
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; CHECK-LABEL: ucmp_64_64:
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; CHECK: # %bb.0:
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; CHECK-NEXT: subc 5, 4, 3
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; CHECK-NEXT: cmpld 3, 4
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; CHECK-NEXT: li 3, -1
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; CHECK-NEXT: subfe 5, 4, 4
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; CHECK-NEXT: neg 5, 5
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; CHECK-NEXT: isellt 3, 3, 5
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; CHECK-NEXT: blr
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%1 = call i64 @llvm.ucmp(i64 %x, i64 %y)
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ret i64 %1
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}
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