Mesa (main): intel/compiler: Make decision based on source type instead of opcode
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Fri Jul 16 17:20:55 UTC 2021
Module: Mesa
Branch: main
Commit: cde9ca616d7bd2ecdf3281f087e9c7acccc85192
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=cde9ca616d7bd2ecdf3281f087e9c7acccc85192
Author: Sagar Ghuge <sagar.ghuge at intel.com>
Date: Wed Jul 7 18:10:19 2021 -0700
intel/compiler: Make decision based on source type instead of opcode
This patch restructure code a little bit to check if source can be
represented as immediate operand. This is a foundation for next patch
which add checks for integer operand as well.
Suggested-by: Jason Ekstrand <jason at jlekstrand.net>
Signed-off-by: Sagar Ghuge <sagar.ghuge at intel.com>
Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11596>
---
src/intel/compiler/brw_fs_combine_constants.cpp | 40 +++++++++++++++++--------
1 file changed, 28 insertions(+), 12 deletions(-)
diff --git a/src/intel/compiler/brw_fs_combine_constants.cpp b/src/intel/compiler/brw_fs_combine_constants.cpp
index 50ddb7e645f..ff5f1ec9d18 100644
--- a/src/intel/compiler/brw_fs_combine_constants.cpp
+++ b/src/intel/compiler/brw_fs_combine_constants.cpp
@@ -336,20 +336,41 @@ representable_as_hf(float f, uint16_t *hf)
}
static bool
-represent_src_as_imm(const struct intel_device_info *devinfo,
- fs_reg *src)
+supports_src_as_imm(const struct intel_device_info *devinfo, enum opcode op)
{
+ switch (op) {
+ case BRW_OPCODE_MAD:
+ return devinfo->ver == 12 && devinfo->verx10 < 125;
+ default:
+ return false;
+ }
+}
+
+static bool
+can_promote_src_as_imm(const struct intel_device_info *devinfo, fs_inst *inst,
+ unsigned src_idx)
+{
+ /* Experiment shows that we can only support src0 as immediate */
+ if (src_idx != 0)
+ return false;
+
+ if (!supports_src_as_imm(devinfo, inst->opcode))
+ return false;
+
/* TODO - Fix the codepath below to use a bfloat16 immediate on XeHP,
* since HF/F mixed mode has been removed from the hardware.
*/
- if (devinfo->ver == 12 && devinfo->verx10 < 125) {
+ switch(inst->src[src_idx].type) {
+ case BRW_REGISTER_TYPE_F: {
uint16_t hf;
- if (representable_as_hf(src->f, &hf)) {
- *src = retype(brw_imm_uw(hf), BRW_REGISTER_TYPE_HF);
+ if (representable_as_hf(inst->src[src_idx].f, &hf)) {
+ inst->src[src_idx] = retype(brw_imm_uw(hf), BRW_REGISTER_TYPE_HF);
return true;
}
}
- return false;
+ default:
+ return false;
+ }
}
bool
@@ -375,17 +396,12 @@ fs_visitor::opt_combine_constants()
if (!could_coissue(devinfo, inst) && !must_promote_imm(devinfo, inst))
continue;
- bool represented_as_imm = false;
for (int i = 0; i < inst->sources; i++) {
if (inst->src[i].file != IMM)
continue;
- if (!represented_as_imm && i == 0 &&
- inst->opcode == BRW_OPCODE_MAD &&
- represent_src_as_imm(devinfo, &inst->src[i])) {
- represented_as_imm = true;
+ if (can_promote_src_as_imm(devinfo, inst, i))
continue;
- }
char data[8];
brw_reg_type type;
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