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f3c547dbf4
This patch moves the class for scheduling adjacent instructions, MacroFusion, to the target. In AArch64, it also expands the fusion to all instructions pairs in a scheduling block, beyond just among the predecessors of the branch at the end. Differential revision: https://reviews.llvm.org/D28489 llvm-svn: 293737
29 lines
786 B
LLVM
29 lines
786 B
LLVM
; RUN: llc -o - %s -mattr=+arith-cbz-fusion | FileCheck %s
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; RUN: llc -o - %s -mcpu=cyclone | FileCheck %s
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target triple = "aarch64-unknown"
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declare void @foobar(i32 %v0, i32 %v1)
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; Make sure sub is scheduled in front of cbnz
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; CHECK-LABEL: test_sub_cbz:
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; CHECK: sub w[[SUBRES:[0-9]+]], w0, #13
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; CHECK-NEXT: cbnz w[[SUBRES]], {{.?LBB[0-9_]+}}
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define void @test_sub_cbz(i32 %a0, i32 %a1) {
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entry:
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; except for the fusion opportunity the sub/add should be equal so the
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; scheduler would leave them in source order if it weren't for the scheduling
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%v0 = sub i32 %a0, 13
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%cond = icmp eq i32 %v0, 0
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%v1 = add i32 %a1, 7
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br i1 %cond, label %if, label %exit
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if:
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call void @foobar(i32 %v1, i32 %v0)
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br label %exit
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exit:
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call void @foobar(i32 %v0, i32 %v1)
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ret void
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}
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