[LLVMbugs] [Bug 22390] New: New vector shuffle legality: turns blendps into shufps x2.
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Thu Jan 29 11:39:36 PST 2015
http://llvm.org/bugs/show_bug.cgi?id=22390
Bug ID: 22390
Summary: New vector shuffle legality: turns blendps into shufps
x2.
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedbugs at nondot.org
Reporter: ahmed.bougacha at gmail.com
CC: llvmbugs at cs.uiuc.edu
Classification: Unclassified
Created attachment 13764
--> http://llvm.org/bugs/attachment.cgi?id=13764&action=edit
IR testcase
For the attached IR, we used to generate:
vpermilps $147, %xmm0, %xmm0 ## xmm0 = xmm0[3,0,1,2]
vblendps $1, %xmm1, %xmm0, %xmm1 ## xmm1 = xmm1[0],xmm0[1,2,3]
vaddps %xmm1, %xmm0, %xmm0
With the new all-shuffles-are-legal lowering, we now generate:
vpermilps $147, %xmm0, %xmm2 ## xmm2 = xmm0[3,0,1,2]
vshufps $0, %xmm0, %xmm1, %xmm1 ## xmm1 = xmm1[0,0],xmm0[0,0]
vshufps $152, %xmm0, %xmm1, %xmm0 ## xmm0 = xmm1[0,2],xmm0[1,2]
vaddps %xmm0, %xmm2, %xmm0
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