834cc88c5d
lowerBuildVectorAsBroadcast will not broadcast splat constants in all cases, resulting in a lot of situations where a full width vector load that has failed to fold but is loading splat constant values could use a broadcast load instruction just as cheaply, and save constant pool space. NOTE: SSE3 targets can use MOVDDUP but not all SSE era CPUs can perform this as cheaply as a vector load, we will need to add scheduler model checks if we want to pursue this. This is an updated commit of98061013e0after being reverted ata279a09ab9
40 lines
1.6 KiB
LLVM
40 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mcpu=btver2 %s -o - | FileCheck %s
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; Test desc: two functions (foo, bar) with byval arguments, should not have
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; reads/writes from/to byval storage re-ordered.
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; When broken, five "1" constants are written into the byval %struct.face,
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; but the subsequent byval read of that struct (call to bar) gets re-ordered
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; before those writes, illegally.
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source_filename = "test.c"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-linux-gnu"
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%struct.face = type { [7 x i32] }
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; Function Attrs: noinline nounwind uwtable
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declare void @bar(ptr byval(%struct.face) nocapture readonly align 8);
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; Function Attrs: noinline nounwind uwtable
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define void @foo(ptr byval(%struct.face) nocapture align 8) local_unnamed_addr {
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; CHECK-LABEL: foo:
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; CHECK: # %bb.0:
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; CHECK-NEXT: subq $40, %rsp
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; CHECK-NEXT: .cfi_def_cfa_offset 48
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; CHECK-NEXT: vbroadcastss {{.*#+}} xmm0 = [1,1,1,1]
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; CHECK-NEXT: vmovaps %xmm0, {{[0-9]+}}(%rsp)
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; CHECK-NEXT: movl $1, {{[0-9]+}}(%rsp)
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; CHECK-NEXT: vmovups {{[0-9]+}}(%rsp), %xmm0
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; CHECK-NEXT: vmovups %xmm0, {{[0-9]+}}(%rsp)
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; CHECK-NEXT: vmovaps {{[0-9]+}}(%rsp), %xmm0
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; CHECK-NEXT: vmovups %xmm0, (%rsp)
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; CHECK-NEXT: callq bar@PLT
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; CHECK-NEXT: addq $40, %rsp
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: retq
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store <4 x i32> <i32 1, i32 1, i32 1, i32 1>, ptr %0, align 8
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%2 = getelementptr inbounds %struct.face, ptr %0, i64 0, i32 0, i64 4
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store i32 1, ptr %2, align 8
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call void @bar(ptr byval(%struct.face) nonnull align 8 %0)
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ret void
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}
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