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https://github.com/c64scene-ar/llvm-6502.git
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52f83a9ab3
The main issue being fixed here is that APCS targets handling a "byval align N" parameter with N > 4 were miscounting what objects were where on the stack, leading to FrameLowering setting the frame pointer incorrectly and clobbering the stack. But byval handling had grown over many years, and had multiple layers of cruft trying to compensate for each other and calculate padding correctly. This only really needs to be done once, in the HandleByVal function. Elsewhere should just do what it's told by that call. I also stripped out unnecessary APCS/AAPCS distinctions (now that Clang emits byvals with the correct C ABI alignment), which simplified HandleByVal. rdar://20095672 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231959 91177308-0d34-0410-b5e6-96231b3b80d8
30 lines
850 B
LLVM
30 lines
850 B
LLVM
; RUN: llc < %s -mtriple=armv7-linux-gnueabihf | FileCheck %s -check-prefix=EABI
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; RUN: llc < %s -march=arm -mtriple=arm-linux-gnu | FileCheck %s -check-prefix=OABI
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define i32 @f(i32 %a, ...) {
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entry:
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%a_addr = alloca i32 ; <i32*> [#uses=1]
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%retval = alloca i32, align 4 ; <i32*> [#uses=2]
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%tmp = alloca i32, align 4 ; <i32*> [#uses=2]
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store i32 %a, i32* %a_addr
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store i32 0, i32* %tmp
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%tmp1 = load i32, i32* %tmp ; <i32> [#uses=1]
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store i32 %tmp1, i32* %retval
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call void @llvm.va_start(i8* null)
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call void asm sideeffect "", "~{d8}"()
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br label %return
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return: ; preds = %entry
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%retval2 = load i32, i32* %retval ; <i32> [#uses=1]
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ret i32 %retval2
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; EABI: add sp, sp, #16
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; EABI: vpop {d8}
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; EABI: add sp, sp, #4
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; EABI: add sp, sp, #12
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; OABI: add sp, sp, #12
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; OABI: add sp, sp, #12
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}
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declare void @llvm.va_start(i8*) nounwind
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