6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-24 22:24:54 +00:00
Code Issues Projects Releases Wiki Activity

[X86][AVX] Fix failure due to a missing ISel pattern to select VBROADCAST nodes (PR23259).

Browse Source 
This fixes a regression introduced at revision 218263.

On AVX, if we optimize for size, a splat build_vector of a load
is lowered into a VBROADCAST node. This is done even if the value type of the
splat build_vector node is v2i64.

Since AVX doesn't support v2f64/v2i64 broadcasts, revision 218263 added two
extra tablegen patterns to allow selecting a VMOVDDUPrm from an X86VBroadcast
where the scalar element comes from a loadi64/loadf64.

However, revision 218263 forgot to add an extra fallback pattern for the case
where we have a X86VBroadcast of a loadi64 with multiple uses.

This patch adds the missing tablegen pattern in X86InstrSSE.td.
This patch also adds an extra test to 'splat-for-size.ll' to verify that ISel
doesn't crash with a 'fatal error in the backend' due to a missing AVX pattern
to select v2i64 X86ISD::BROADCAST nodes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235509 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrea Di Biagio
2015-04-22 14:53:39 +00:00
parent 829fcadede
commit 6c347524e2
2 changed files with 18 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
lib/Target/X86/X86InstrSSE.td
View File

@@ -5223,9 +5223,9 @@ let Predicates = [HasAVX] in {
let Predicates = [UseAVX, OptForSize] in {
def : Pat<(v2f64 (X86VBroadcast (loadf64 addr:$src))),
(VMOVDDUPrm addr:$src)>;
(VMOVDDUPrm addr:$src)>;
def : Pat<(v2i64 (X86VBroadcast (loadi64 addr:$src))),
(VMOVDDUPrm addr:$src)>;
(VMOVDDUPrm addr:$src)>;
}
let Predicates = [UseSSE3] in {
@@ -8478,6 +8478,8 @@ let Predicates = [HasAVX] in {
def : Pat<(v2f64 (X86VBroadcast f64:$src)),
(VMOVDDUPrr (COPY_TO_REGCLASS FR64:$src, VR128))>;
def : Pat<(v2i64 (X86VBroadcast i64:$src)),
(VMOVDDUPrr (COPY_TO_REGCLASS GR64:$src, VR128))>;
}
//===----------------------------------------------------------------------===//