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[AMDGPU] Asm/disasm v_cndmask_b32_e64 with abs/neg source modifiers

Authored by tpr on Mar 18 2019, 12:25 PM.

Description

[AMDGPU] Asm/disasm v_cndmask_b32_e64 with abs/neg source modifiers

This commit allows v_cndmask_b32_e64 with abs, neg source
modifiers on src0, src1 to be assembled and disassembled.

This does appear to be allowed, even though they are floating point
modifiers and the operand type is b32.

To do this, I added src0_modifiers and src1_modifiers to the
MachineInstr, which involved fixing up several places in codegen and mir
tests.

Differential Revision: https://reviews.llvm.org/D59191

Change-Id: I69bf4a8c73ebc65744f6110bb8fc4e937d79fbea
llvm-svn: 356398

Details