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i965/fs: Fix code emission for imul_high in NIR. 

Copy over from brw_fs_visitor.cpp.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner 2015-04-24 11:28:05 -07:00
parent ecf428aa59
commit 0c06d019bc
1 changed files with 23 additions and 1 deletions
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24
src/mesa/drivers/dri/i965/brw_fs_nir.cpp
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@ -827,8 +827,30 @@ fs_visitor::nir_emit_alu(nir_alu_instr *instr)
struct brw_reg acc = retype(brw_acc_reg(dispatch_width), result.type);
emit(MUL(acc, op[0], op[1]));
fs_inst *mul = emit(MUL(acc, op[0], op[1]));
emit(MACH(result, op[0], op[1]));
/* Until Gen8, integer multiplies read 32-bits from one source, and
* 16-bits from the other, and relying on the MACH instruction to
* generate the high bits of the result.
*
* On Gen8, the multiply instruction does a full 32x32-bit multiply,
* but in order to do a 64x64-bit multiply we have to simulate the
* previous behavior and then use a MACH instruction.
*
* FINISHME: Don't use source modifiers on src1.
*/
if (devinfo->gen >= 8) {
assert(mul->src[1].type == BRW_REGISTER_TYPE_D ||
mul->src[1].type == BRW_REGISTER_TYPE_UD);
if (mul->src[1].type == BRW_REGISTER_TYPE_D) {
mul->src[1].type = BRW_REGISTER_TYPE_W;
mul->src[1].stride = 2;
} else {
mul->src[1].type = BRW_REGISTER_TYPE_UW;
mul->src[1].stride = 2;
}
}
break;
}