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In this particular example we wouldn't want the smmls anyway (the value is actually unused), but in general smmls does not provide the required flags register so if that SUBE result is used we can't replace it. llvm-svn: 277541
68 lines
2.1 KiB
LLVM
68 lines
2.1 KiB
LLVM
; RUN: llc -mtriple=arm-eabi %s -o - | FileCheck %s -check-prefix=CHECK
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; RUN: llc -mtriple=armv6-eabi %s -o - | FileCheck %s -check-prefix=CHECK-V6
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; RUN: llc -mtriple=armv7-eabi %s -o - | FileCheck %s -check-prefix=CHECK-V7
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; RUN: llc -mtriple=thumb-eabi %s -o - | FileCheck %s -check-prefix=CHECK-THUMB
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; RUN: llc -mtriple=thumbv6-eabi %s -o - | FileCheck %s -check-prefix=CHECK-THUMB
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; RUN: llc -mtriple=thumbv6t2-eabi %s -o - | FileCheck %s -check-prefix=CHECK-THUMBV6T2
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; RUN: llc -mtriple=thumbv7-eabi %s -o - | FileCheck %s -check-prefix=CHECK-THUMBV7
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define i32 @Test0(i32 %a, i32 %b, i32 %c) nounwind readnone ssp {
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entry:
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; CHECK-LABEL: Test0
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; CHECK-NOT: smmls
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; CHECK-V6-NOT: smmls
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; CHECK-V7-NOT: smmls
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; CHECK_THUMB-NOT: smmls
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; CHECK-THUMBV6T2-NOT: smmls
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; CHECK-THUMBV7-NOT: smmls
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%conv4 = zext i32 %a to i64
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%conv1 = sext i32 %b to i64
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%conv2 = sext i32 %c to i64
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%mul = mul nsw i64 %conv2, %conv1
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%shr5 = lshr i64 %mul, 32
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%sub = sub nsw i64 %conv4, %shr5
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%conv3 = trunc i64 %sub to i32
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ret i32 %conv3
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}
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define i32 @Test1(i32 %a, i32 %b, i32 %c) {
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;CHECK-LABEL: Test1
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;CHECK-NOT: smmls
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;CHECK-THUMB-NOT: smmls
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;CHECK-V6: smmls r0, [[Rn:r[1-2]]], [[Rm:r[1-2]]], r0
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;CHECK-V7: smmls r0, [[Rn:r[1-2]]], [[Rm:r[1-2]]], r0
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;CHECK-THUMBV6T2: smmls r0, [[Rn:r[1-2]]], [[Rm:r[1-2]]], r0
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;CHECK-THUMBV7: smmls r0, [[Rn:r[1-2]]], [[Rm:r[1-2]]], r0
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entry:
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%conv = sext i32 %b to i64
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%conv1 = sext i32 %c to i64
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%mul = mul nsw i64 %conv1, %conv
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%conv26 = zext i32 %a to i64
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%shl = shl nuw i64 %conv26, 32
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%sub = sub nsw i64 %shl, %mul
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%shr7 = lshr i64 %sub, 32
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%conv3 = trunc i64 %shr7 to i32
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ret i32 %conv3
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}
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declare void @opaque(i32)
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define void @test_used_flags(i32 %in1, i32 %in2) {
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; CHECK-V7-LABEL: test_used_flags:
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; CHECK-V7: smull [[PROD_LO:r[0-9]+]], [[PROD_HI:r[0-9]+]], r0, r1
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; CHECK-V7: rsbs {{.*}}, [[PROD_LO]], #0
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; CHECK-V7: rscs {{.*}}, [[PROD_HI]], #0
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%in1.64 = sext i32 %in1 to i64
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%in2.64 = sext i32 %in2 to i64
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%mul = mul nsw i64 %in1.64, %in2.64
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%tst = icmp slt i64 %mul, 1
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br i1 %tst, label %true, label %false
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true:
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call void @opaque(i32 42)
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ret void
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false:
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call void @opaque(i32 56)
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ret void
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}
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