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fix PR4984 by ensuring that fastisel adds properly sign extended GEP displacement

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values to machineinstrs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81886 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-09-15 18:27:02 +00:00
parent 371b8fc41c
commit dffb6e5aee
2 changed files with 23 additions and 3 deletions
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2
lib/Target/X86/X86InstrBuilder.h
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@ -47,7 +47,7 @@ struct X86AddressMode {
unsigned Scale;
unsigned IndexReg;
unsigned Disp;
int Disp;
GlobalValue *GV;
unsigned GVOpFlags;

24
test/CodeGen/X86/fast-isel-gep.ll
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@ -1,10 +1,9 @@
; RUN: llc < %s -march=x86-64 -O0 | FileCheck %s --check-prefix=X64
; RUN: llc < %s -march=x86 -O0 | FileCheck %s --check-prefix=X32
; PR3181
; GEP indices are interpreted as signed integers, so they
; should be sign-extended to 64 bits on 64-bit targets.
; PR3181
define i32 @test1(i32 %t3, i32* %t1) nounwind {
%t9 = getelementptr i32* %t1, i32 %t3 ; <i32*> [#uses=1]
%t15 = load i32* %t9 ; <i32> [#uses=1]
@ -31,3 +30,24 @@ define i32 @test2(i64 %t3, i32* %t1) nounwind {
; X64: movl (%rsi,%rdi,4), %eax
; X64: ret
}
; PR4984
define i8 @test3(i8* %start) nounwind {
entry:
%A = getelementptr i8* %start, i64 -2 ; <i8*> [#uses=1]
%B = load i8* %A, align 1 ; <i8> [#uses=1]
ret i8 %B
; X32: test3:
; X32: movl 4(%esp), %eax
; X32: movb -2(%eax), %al
; X32: ret
; X64: test3:
; X64: movb -2(%rdi), %al
; X64: ret
}