http://llvm.org/bugs/show_bug.cgi?id=12542
Bug #: 12542
Summary: IntrinsicEmitter generate wrong target intrinsics
attribute getting code.
Product: new-bugs
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 8381
--> http://llvm.org/bugs/attachment.cgi?id=8381
The patch that fix the bug
The IntrinisicEmitter use an index array to map intrinsic id to identical
attributes by assuming the value of the intrinsic id is start from zero. But
this is incorrect when generating target specific intrinsic, because they are
start from Intrinsic::num_intrinsics, i.e. the value of first target spesific
intrinsic is equal to Intrinsic::num_intrinsics instead of 0. As a result, the
code generated by IntrinisicEmitter is incorrect, e.g.:
static AttrListPtr getAttributes(mblazeIntrinsic::ID id) {
static const uint8_t IntrinsicsToAttributesMap[] = {
255, // Invalid intrinsic
1, // llvm.mblaze.fsl.aget
1, // llvm.mblaze.fsl.aput
1, // llvm.mblaze.fsl.caget
...
}
AttributeWithIndex AWI[1];
unsigned NumAttrs = 0;
// Wrong, should be IntrinsicsToAttributesMap[id -Intrinsic::num_intrinsics
+ 1]!
switch(IntrinsicsToAttributesMap[id]) {
...
In fact, i find this bug in my private backend, so i cannot attach a regression
at the moment.
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