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8f0afb6658
On PPC64, for a variadic function, if va_start is not called, it won't access any variadic argument on stack, thus we can save stores of registers used to pass arguments. Differential Revision: https://reviews.llvm.org/D82361
60 lines
1.5 KiB
LLVM
60 lines
1.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -ppc-asm-full-reg-names -verify-machineinstrs -mtriple=powerpc64 \
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; RUN: < %s | FileCheck --check-prefix=BE %s
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; RUN: llc -ppc-asm-full-reg-names -verify-machineinstrs -mtriple=powerpc64le \
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; RUN: < %s | FileCheck --check-prefix=LE %s
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define i32 @f(...) nounwind {
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; BE-LABEL: f:
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; BE: # %bb.0: # %entry
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; BE-NEXT: li r3, 0
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; BE-NEXT: blr
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;
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; LE-LABEL: f:
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; LE: # %bb.0: # %entry
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; LE-NEXT: li r3, 0
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; LE-NEXT: blr
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entry:
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ret i32 0
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}
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define i32 @f1(...) nounwind {
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; BE-LABEL: f1:
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; BE: # %bb.0: # %entry
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; BE-NEXT: mr r11, r3
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; BE-NEXT: addi r12, r1, 48
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; BE-NEXT: li r3, 0
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; BE-NEXT: std r11, 48(r1)
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; BE-NEXT: std r4, 56(r1)
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; BE-NEXT: std r5, 64(r1)
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; BE-NEXT: std r6, 72(r1)
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; BE-NEXT: std r7, 80(r1)
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; BE-NEXT: std r8, 88(r1)
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; BE-NEXT: std r9, 96(r1)
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; BE-NEXT: std r10, 104(r1)
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; BE-NEXT: std r12, -8(r1)
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; BE-NEXT: blr
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;
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; LE-LABEL: f1:
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; LE: # %bb.0: # %entry
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; LE-NEXT: std r3, 32(r1)
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; LE-NEXT: std r4, 40(r1)
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; LE-NEXT: addi r4, r1, 32
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; LE-NEXT: li r3, 0
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; LE-NEXT: std r5, 48(r1)
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; LE-NEXT: std r6, 56(r1)
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; LE-NEXT: std r7, 64(r1)
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; LE-NEXT: std r8, 72(r1)
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; LE-NEXT: std r9, 80(r1)
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; LE-NEXT: std r10, 88(r1)
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; LE-NEXT: std r4, -8(r1)
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; LE-NEXT: blr
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entry:
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%va = alloca i8*, align 8
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%va.cast = bitcast i8** %va to i8*
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call void @llvm.va_start(i8* %va.cast)
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ret i32 0
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}
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declare void @llvm.va_start(i8*) nounwind
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