forked from OSchip/llvm-project
84 lines
2.4 KiB
LLVM
84 lines
2.4 KiB
LLVM
; RUN: opt < %s -passes=deadargelim -S | FileCheck %s
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declare token @llvm.call.preallocated.setup(i32)
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declare i8* @llvm.call.preallocated.arg(token, i32)
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%Ty = type <{ i32, i32 }>
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; Check if the pass doesn't modify anything that doesn't need changing. We feed
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; an unused argument to each function to lure it into changing _something_ about
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; the function and then changing too much.
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; This checks if the return value attributes are not removed
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; CHECK: define internal zeroext i32 @test1() #1
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define internal zeroext i32 @test1(i32 %DEADARG1) nounwind {
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;
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;
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ret i32 1
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}
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; This checks if the struct doesn't get non-packed
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; CHECK-LABEL: define internal <{ i32, i32 }> @test2(
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define internal <{ i32, i32 }> @test2(i32 %DEADARG1) {
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;
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;
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ret <{ i32, i32 }> <{ i32 1, i32 2 }>
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}
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; We use this external function to make sure the return values don't become dead
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declare void @user(i32, <{ i32, i32 }>)
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define void @caller() {
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;
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;
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%B = call i32 @test1(i32 1)
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%C = call <{ i32, i32 }> @test2(i32 2)
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call void @user(i32 %B, <{ i32, i32 }> %C)
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ret void
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}
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; We can't remove 'this' here, as that would put argmem in ecx instead of
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; memory.
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define internal x86_thiscallcc i32 @unused_this(i32* %this, i32* inalloca(i32) %argmem) {
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;
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;
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%v = load i32, i32* %argmem
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ret i32 %v
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}
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; CHECK-LABEL: define internal x86_thiscallcc i32 @unused_this(i32* %this, i32* inalloca(i32) %argmem)
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define i32 @caller2() {
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;
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;
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%t = alloca i32
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%m = alloca inalloca i32
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store i32 42, i32* %m
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%v = call x86_thiscallcc i32 @unused_this(i32* %t, i32* inalloca(i32) %m)
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ret i32 %v
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}
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; We can't remove 'this' here, as that would put argmem in ecx instead of
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; memory.
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define internal x86_thiscallcc i32 @unused_this_preallocated(i32* %this, i32* preallocated(i32) %argmem) {
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;
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;
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%v = load i32, i32* %argmem
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ret i32 %v
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}
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; CHECK-LABEL: define internal x86_thiscallcc i32 @unused_this_preallocated(i32* %this, i32* preallocated(i32) %argmem)
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define i32 @caller3() {
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;
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;
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%t = alloca i32
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%c = call token @llvm.call.preallocated.setup(i32 1)
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%M = call i8* @llvm.call.preallocated.arg(token %c, i32 0) preallocated(i32)
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%m = bitcast i8* %M to i32*
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store i32 42, i32* %m
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%v = call x86_thiscallcc i32 @unused_this_preallocated(i32* %t, i32* preallocated(i32) %m) ["preallocated"(token %c)]
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ret i32 %v
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}
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; CHECK: attributes #0 = { nocallback nofree nosync nounwind willreturn }
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; CHECK: attributes #1 = { nounwind }
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