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370b1ac7f7
Summary: Integer types smaller than i32 must be extended to i32 by default. The feature "crbits" introduced at r202451 handles i1 as a special case, but it did not extend properly. The caller was, therefore, passing i1 stack arguments by writing 0/1 to the first byte of the 4-byte stack object and callee was reading the first byte for the value. "crbits" is enabled if the optimization level is greater than 1, which is very common in "release builds". Such discrepancies with ABI specification also introduces potential incompatibility with programs or libraries built with other compilers e.g. GCC. Fixes PR38661 Reviewers: hfinkel, cuviper Subscribers: sylvestre.ledru, glaubitz, nagisa, nemanjai, kbarton, llvm-commits Differential Revision: https://reviews.llvm.org/D51108 llvm-svn: 342288
25 lines
520 B
LLVM
25 lines
520 B
LLVM
; RUN: llc -verify-machineinstrs < %s -mcpu=ppc32 -mattr=+crbits | FileCheck %s
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target triple = "powerpc-unknown-linux-gnu"
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define void @check_callee(
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i32, i32, i32, i32,
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i32, i32, i32, i32,
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i1 zeroext %s1
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) {
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call void @check_caller(
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i32 9, i32 9, i32 9, i32 9,
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i32 9, i32 9, i32 9, i32 9,
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i1 zeroext %s1)
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ret void
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}
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; CHECK-LABEL: @check_callee
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; CHECK: lbz {{[0-9]+}}, 27(1)
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; CHECK: stw {{[0-9]+}}, 8(1)
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declare void @check_caller(
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i32, i32, i32, i32,
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i32, i32, i32, i32,
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i1 zeroext
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)
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