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57 lines
1.3 KiB
LLVM
57 lines
1.3 KiB
LLVM
; RUN: llc < %s -march=x86-64 -o - | FileCheck %s
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; Reuse the flags value from the add instructions instead of emitting separate
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; testl instructions.
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; Use the flags on the add.
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; CHECK: add_zf:
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; CHECK: addl (%rdi), %esi
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; CHECK-NEXT: movl %edx, %eax
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; CHECK-NEXT: cmovnsl %ecx, %eax
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; CHECK-NEXT: ret
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define i32 @add_zf(i32* %x, i32 %y, i32 %a, i32 %b) nounwind {
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%tmp2 = load i32* %x, align 4 ; <i32> [#uses=1]
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%tmp4 = add i32 %tmp2, %y ; <i32> [#uses=1]
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%tmp5 = icmp slt i32 %tmp4, 0 ; <i1> [#uses=1]
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%tmp.0 = select i1 %tmp5, i32 %a, i32 %b ; <i32> [#uses=1]
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ret i32 %tmp.0
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}
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declare void @foo(i32)
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; Don't use the flags result of the and here, since the and has no
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; other use. A simple test is better.
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; CHECK: bar:
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; CHECK: testb $16, %dil
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define void @bar(i32 %x) nounwind {
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%y = and i32 %x, 16
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%t = icmp eq i32 %y, 0
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br i1 %t, label %true, label %false
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true:
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call void @foo(i32 %x)
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ret void
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false:
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ret void
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}
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; Do use the flags result of the and here, since the and has another use.
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; CHECK: qux:
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; CHECK: andl $16, %edi
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; CHECK-NEXT: jne
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define void @qux(i32 %x) nounwind {
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%y = and i32 %x, 16
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%t = icmp eq i32 %y, 0
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br i1 %t, label %true, label %false
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true:
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call void @foo(i32 %y)
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ret void
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false:
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ret void
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}
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