4ed94a06ac
This matches what MSVC does for alloca() function calls on ARM. Even if MSVC doesn't support VLAs at the language level, it does support the alloca function. On the clang level, both the _alloca() (when emulating MSVC, which is what the alloca() function expands to) and __builtin_alloca() builtin functions, and VLAs, map to the same LLVM IR "alloca" function - so within LLVM they're not distinguishable from each other. Differential Revision: https://reviews.llvm.org/D42292 llvm-svn: 323308
29 lines
1.1 KiB
LLVM
29 lines
1.1 KiB
LLVM
; RUN: llc -mtriple=thumbv7-windows-itanium -mcpu=cortex-a9 -o - %s \
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; RUN: | FileCheck %s -check-prefix CHECK-SMALL-CODE
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; RUN: llc -mtriple=thumbv7-windows-itanium -mcpu=cortex-a9 -code-model=large -o - %s \
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; RUN: | FileCheck %s -check-prefix CHECK-LARGE-CODE
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; RUN: llc -mtriple=thumbv7-windows-msvc -mcpu=cortex-a9 -o - %s \
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; RUN: | FileCheck %s -check-prefix CHECK-SMALL-CODE
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define arm_aapcs_vfpcc i8 @function(i32 %sz, i32 %idx) {
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entry:
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%vla = alloca i8, i32 %sz, align 1
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%arrayidx = getelementptr inbounds i8, i8* %vla, i32 %idx
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%0 = load volatile i8, i8* %arrayidx, align 1
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ret i8 %0
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}
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; CHECK-SMALL-CODE: adds [[R4:r[0-9]+]], #7
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; CHECK-SMALL-CODE: bic [[R4]], [[R4]], #7
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; CHECK-SMALL-CODE: lsrs r4, [[R4]], #2
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; CHECK-SMALL-CODE: bl __chkstk
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; CHECK-SMALL-CODE: sub.w sp, sp, r4
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; CHECK-LARGE-CODE: adds [[R4:r[0-9]+]], #7
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; CHECK-LARGE-CODE: bic [[R4]], [[R4]], #7
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; CHECK-LARGE-CODE: lsrs r4, [[R4]], #2
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; CHECK-LARGE-CODE: movw [[IP:r[0-9]+]], :lower16:__chkstk
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; CHECK-LARGE-CODE: movt [[IP]], :upper16:__chkstk
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; CHECK-LARGE-CODE: blx [[IP]]
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; CHECK-LARGE-CODE: sub.w sp, sp, r4
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