36 lines
1.2 KiB
LLVM
36 lines
1.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -reassociate -dce < %s | FileCheck %s
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; The two va_arg instructions depend on the memory/context, are therfore not
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; identical and the sub should not be optimized to 0 by reassociate.
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;
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; ...
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; ...
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define i32 @func(i32 %dummy, ...) {
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;
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; CHECK-LABEL: @func(
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; CHECK-NEXT: [[VARARGS:%.*]] = alloca i8*, align 8
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; CHECK-NEXT: [[VARARGS1:%.*]] = bitcast i8** [[VARARGS]] to i8*
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; CHECK-NEXT: call void @llvm.va_start(i8* [[VARARGS1]])
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; CHECK-NEXT: [[V0:%.*]] = va_arg i8** [[VARARGS]], i32
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; CHECK-NEXT: [[V1:%.*]] = va_arg i8** [[VARARGS]], i32
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; CHECK-NEXT: [[V0_NEG:%.*]] = sub i32 0, [[V0]]
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; CHECK-NEXT: [[SUB:%.*]] = add i32 [[V0_NEG]], 1
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; CHECK-NEXT: [[ADD:%.*]] = add i32 [[SUB]], [[V1]]
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; CHECK-NEXT: call void @llvm.va_end(i8* [[VARARGS1]])
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; CHECK-NEXT: ret i32 [[ADD]]
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;
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%varargs = alloca i8*, align 8
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%varargs1 = bitcast i8** %varargs to i8*
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call void @llvm.va_start(i8* %varargs1)
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%v0 = va_arg i8** %varargs, i32
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%v1 = va_arg i8** %varargs, i32
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%sub = sub nsw i32 %v1, %v0
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%add = add nsw i32 %sub, 1
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call void @llvm.va_end(i8* %varargs1)
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ret i32 %add
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}
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declare void @llvm.va_start(i8*)
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declare void @llvm.va_end(i8*)
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