6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-02-10 20:33:15 +00:00
Code Issues Projects Releases Wiki Activity

PR3439: Correct a silly mistake in the SimplifyDemandedUseBits code for

Browse Source 
SRem.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73598 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2009-06-17 02:57:36 +00:00
parent 63dc318085
commit a999a511f7
2 changed files with 19 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -1336,7 +1336,7 @@ Value *InstCombiner::SimplifyDemandedUseBits(Value *V, APInt DemandedMask,
if (ConstantInt *Rem = dyn_cast<ConstantInt>(I->getOperand(1))) {
APInt RA = Rem->getValue().abs();
if (RA.isPowerOf2()) {
if (DemandedMask.ule(RA)) // srem won't affect demanded bits
if (DemandedMask.ult(RA)) // srem won't affect demanded bits
return I->getOperand(0);
APInt LowBits = RA - 1;

18
test/Transforms/InstCombine/2009-06-16-SRemDemandedBits.ll Normal file
View File

@ -0,0 +1,18 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep srem
; PR3439
define i32 @a(i32 %x) nounwind {
entry:
%rem = srem i32 %x, 2
%and = and i32 %rem, 2
ret i32 %and
}
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep srem
; PR3439
define i32 @a(i32 %x) nounwind {
entry:
%rem = srem i32 %x, 2
%and = and i32 %rem, 2
ret i32 %and
}