34 lines
996 B
LLVM
34 lines
996 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=x86_64-- < %s | FileCheck %s
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; These sequences don't need neg instructions; they can be done with
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; a single shift and sub each.
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define i64 @foo(i64 %x, i64 %y, i64 %n) nounwind {
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; CHECK-LABEL: foo:
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; CHECK: # %bb.0:
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; CHECK-NEXT: movq %rdx, %rcx
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; CHECK-NEXT: movq %rdi, %rax
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; CHECK-NEXT: # kill: def $cl killed $cl killed $rcx
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; CHECK-NEXT: shlq %cl, %rsi
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; CHECK-NEXT: subq %rsi, %rax
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; CHECK-NEXT: retq
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%a = sub i64 0, %y
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%b = shl i64 %a, %n
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%c = add i64 %b, %x
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ret i64 %c
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}
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define i64 @boo(i64 %x, i64 %y, i64 %n) nounwind {
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; CHECK-LABEL: boo:
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; CHECK: # %bb.0:
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; CHECK-NEXT: movq %rdx, %rcx
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; CHECK-NEXT: movq %rdi, %rax
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; CHECK-NEXT: # kill: def $cl killed $cl killed $rcx
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; CHECK-NEXT: shlq %cl, %rsi
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; CHECK-NEXT: subq %rsi, %rax
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; CHECK-NEXT: retq
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%a = sub i64 0, %y
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%b = shl i64 %a, %n
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%c = add i64 %x, %b
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ret i64 %c
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}
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