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https://github.com/c64scene-ar/llvm-6502.git
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8f58e02646
Don't promote byval pointer arguments when when their size in bits is not equal to their alloc size in bits. This can happen for x86_fp80, where the size in bits is 80 but the alloca size in bits in 128. Promoting these types can break passing unions of x86_fp80s and other types. Patch by Thomas Jablin! Reviewed By: rnk Differential Revision: http://reviews.llvm.org/D5057 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216693 91177308-0d34-0410-b5e6-96231b3b80d8
59 lines
1.9 KiB
LLVM
59 lines
1.9 KiB
LLVM
; RUN: opt < %s -argpromotion -S | FileCheck %s
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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-unknown-linux-gnu"
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%union.u = type { x86_fp80 }
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%struct.s = type { double, i16, i8, [5 x i8] }
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@b = internal global %struct.s { double 3.14, i16 9439, i8 25, [5 x i8] undef }, align 16
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%struct.Foo = type { i32, i64 }
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@a = internal global %struct.Foo { i32 1, i64 2 }, align 8
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define void @run() {
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entry:
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tail call i8 @UseLongDoubleUnsafely(%union.u* byval align 16 bitcast (%struct.s* @b to %union.u*))
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tail call x86_fp80 @UseLongDoubleSafely(%union.u* byval align 16 bitcast (%struct.s* @b to %union.u*))
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call i64 @AccessPaddingOfStruct(%struct.Foo* @a)
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call i64 @CaptureAStruct(%struct.Foo* @a)
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ret void
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}
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; CHECK: internal i8 @UseLongDoubleUnsafely(%union.u* byval align 16 %arg) {
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define internal i8 @UseLongDoubleUnsafely(%union.u* byval align 16 %arg) {
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entry:
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%bitcast = bitcast %union.u* %arg to %struct.s*
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%gep = getelementptr inbounds %struct.s* %bitcast, i64 0, i32 2
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%result = load i8* %gep
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ret i8 %result
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}
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; CHECK: internal x86_fp80 @UseLongDoubleSafely(x86_fp80 {{%.*}}) {
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define internal x86_fp80 @UseLongDoubleSafely(%union.u* byval align 16 %arg) {
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%gep = getelementptr inbounds %union.u* %arg, i64 0, i32 0
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%fp80 = load x86_fp80* %gep
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ret x86_fp80 %fp80
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}
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; CHECK: define internal i64 @AccessPaddingOfStruct(%struct.Foo* byval %a) {
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define internal i64 @AccessPaddingOfStruct(%struct.Foo* byval %a) {
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%p = bitcast %struct.Foo* %a to i64*
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%v = load i64* %p
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ret i64 %v
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}
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; CHECK: define internal i64 @CaptureAStruct(%struct.Foo* byval %a) {
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define internal i64 @CaptureAStruct(%struct.Foo* byval %a) {
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entry:
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%a_ptr = alloca %struct.Foo*
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br label %loop
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loop:
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%phi = phi %struct.Foo* [ null, %entry ], [ %gep, %loop ]
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%0 = phi %struct.Foo* [ %a, %entry ], [ %0, %loop ]
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store %struct.Foo* %phi, %struct.Foo** %a_ptr
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%gep = getelementptr %struct.Foo* %a, i64 0
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br label %loop
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}
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