On Tue, Jan 17, 2017 at 01:30:11AM +0300, Andrew Senkevich wrote:
> here is one more part of intrinsics for k-mask registers shifts:
The software developer manuals describe KSHIFT{L,R}* like:
KSHIFTLW
COUNT <- imm8[7:0]
DEST[MAX_KL-1:0] <- 0
IF COUNT <=15
THEN DEST[15:0] <- SRC1[15:0] << COUNT;
FI;
What is the behavior when src1 == dest, like:
kshiftld $3, %k3, %k3
? Is it just a bug in the SDM and will it actually do the expected thing
(set %k3 to %k3 << 3 and clear just the upper bits), or do we need
an early-clobber on the destination to make sure GCC never emits these
insns with the same register as both input and output?
Jakub
