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In the CBackend, use casts to force integer add, subtract, and

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multiply to be done as unsigned, so that they have well defined
behavior on overflow. This fixes PR2408.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53767 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-07-18 18:43:12 +00:00
parent fa82857e41
commit 5a11abaf2c
3 changed files with 42 additions and 1 deletions
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3
test/CodeGen/CBackend/2007-02-23-NameConflicts.ll
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@@ -1,7 +1,8 @@
; PR1164
; RUN: llvm-as < %s | llc -march=c | grep {llvm_cbe_A = \\*llvm_cbe_G;}
; RUN: llvm-as < %s | llc -march=c | grep {llvm_cbe_B = \\*(&ltmp_0_1);}
; RUN: llvm-as < %s | llc -march=c | grep {return (llvm_cbe_A + llvm_cbe_B);}
; RUN: llvm-as < %s | llc -march=c | grep {return (((unsigned int )(((unsigned int )llvm_cbe_A) + ((unsigned int )llvm_cbe_B))));}
@G = global i32 123
@ltmp_0_1 = global i32 123

12
test/CodeGen/CBackend/pr2408.ll Normal file
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@@ -0,0 +1,12 @@
; RUN: llvm-as < %s | llc -march=c | grep {\\* ((unsigned int )}
; PR2408
define i32 @a(i32 %a) {
entry:
%shr = ashr i32 %a, 0 ; <i32> [#uses=1]
%shr2 = ashr i32 2, 0 ; <i32> [#uses=1]
%mul = mul i32 %shr, %shr2 ; <i32> [#uses=1]
%shr4 = ashr i32 2, 0 ; <i32> [#uses=1]
%div = sdiv i32 %mul, %shr4 ; <i32> [#uses=1]
ret i32 %div
}