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opportunities. For example, this lets it emit this: movq (%rax), %rcx addq %rdx, %rcx instead of this: movq %rdx, %rcx addq (%rax), %rcx in the case where %rdx has subsequent uses. It's the same number of instructions, and usually the same encoding size on x86, but it appears faster, and in general, it may allow better scheduling for the load. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106493 91177308-0d34-0410-b5e6-96231b3b80d8
41 lines
1.4 KiB
LLVM
41 lines
1.4 KiB
LLVM
; RUN: llc < %s -relocation-model=static -realign-stack=1 -mcpu=yonah | FileCheck %s
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; The double argument is at 4(esp) which is 16-byte aligned, allowing us to
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; fold the load into the andpd.
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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target triple = "i686-apple-darwin8"
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@G = external global double
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define void @test({ double, double }* byval %z, double* %P) {
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entry:
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%tmp3 = load double* @G, align 16 ; <double> [#uses=1]
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%tmp4 = tail call double @fabs( double %tmp3 ) ; <double> [#uses=1]
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volatile store double %tmp4, double* %P
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%tmp = getelementptr { double, double }* %z, i32 0, i32 0 ; <double*> [#uses=1]
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%tmp1 = volatile load double* %tmp, align 8 ; <double> [#uses=1]
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%tmp2 = tail call double @fabs( double %tmp1 ) ; <double> [#uses=1]
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; CHECK: andpd{{.*}}4(%esp), %xmm
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%tmp6 = fadd double %tmp4, %tmp2 ; <double> [#uses=1]
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volatile store double %tmp6, double* %P, align 8
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ret void
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}
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define void @test2() alignstack(16) {
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entry:
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; CHECK: andl{{.*}}$-16, %esp
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ret void
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}
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; Use a call to force a spill.
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define <2 x double> @test3(<2 x double> %x, <2 x double> %y) alignstack(32) {
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entry:
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; CHECK: andl{{.*}}$-32, %esp
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call void @test2()
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%A = fmul <2 x double> %x, %y
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ret <2 x double> %A
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}
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declare double @fabs(double)
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