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-rw-r--r--src/mesa/drivers/dri/i965/brw_fs.cpp264
1 files changed, 134 insertions, 130 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 0278237101e..17f0eaba311 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -3129,155 +3129,159 @@ fs_visitor::lower_integer_multiplication()
{
bool progress = false;
- /* Gen8's MUL instruction can do a 32-bit x 32-bit -> 32-bit operation
- * directly, but CHV/BXT cannot.
- */
- if (devinfo->gen >= 8 && !devinfo->is_cherryview && !devinfo->is_broxton)
- return false;
-
foreach_block_and_inst_safe(block, fs_inst, inst, cfg) {
- if (inst->opcode != BRW_OPCODE_MUL ||
- inst->dst.is_accumulator() ||
- (inst->dst.type != BRW_REGISTER_TYPE_D &&
- inst->dst.type != BRW_REGISTER_TYPE_UD))
- continue;
-
const fs_builder ibld(this, block, inst);
- /* The MUL instruction isn't commutative. On Gen <= 6, only the low
- * 16-bits of src0 are read, and on Gen >= 7 only the low 16-bits of
- * src1 are used.
- *
- * If multiplying by an immediate value that fits in 16-bits, do a
- * single MUL instruction with that value in the proper location.
- */
- if (inst->src[1].file == IMM &&
- inst->src[1].fixed_hw_reg.dw1.ud < (1 << 16)) {
- if (devinfo->gen < 7) {
- fs_reg imm(GRF, alloc.allocate(dispatch_width / 8),
- inst->dst.type);
- ibld.MOV(imm, inst->src[1]);
- ibld.MUL(inst->dst, imm, inst->src[0]);
- } else {
- ibld.MUL(inst->dst, inst->src[0], inst->src[1]);
- }
- } else {
- /* Gen < 8 (and some Gen8+ low-power parts like Cherryview) cannot
- * do 32-bit integer multiplication in one instruction, but instead
- * must do a sequence (which actually calculates a 64-bit result):
- *
- * mul(8) acc0<1>D g3<8,8,1>D g4<8,8,1>D
- * mach(8) null g3<8,8,1>D g4<8,8,1>D
- * mov(8) g2<1>D acc0<8,8,1>D
- *
- * But on Gen > 6, the ability to use second accumulator register
- * (acc1) for non-float data types was removed, preventing a simple
- * implementation in SIMD16. A 16-channel result can be calculated by
- * executing the three instructions twice in SIMD8, once with quarter
- * control of 1Q for the first eight channels and again with 2Q for
- * the second eight channels.
- *
- * Which accumulator register is implicitly accessed (by AccWrEnable
- * for instance) is determined by the quarter control. Unfortunately
- * Ivybridge (and presumably Baytrail) has a hardware bug in which an
- * implicit accumulator access by an instruction with 2Q will access
- * acc1 regardless of whether the data type is usable in acc1.
- *
- * Specifically, the 2Q mach(8) writes acc1 which does not exist for
- * integer data types.
- *
- * Since we only want the low 32-bits of the result, we can do two
- * 32-bit x 16-bit multiplies (like the mul and mach are doing), and
- * adjust the high result and add them (like the mach is doing):
- *
- * mul(8) g7<1>D g3<8,8,1>D g4.0<8,8,1>UW
- * mul(8) g8<1>D g3<8,8,1>D g4.1<8,8,1>UW
- * shl(8) g9<1>D g8<8,8,1>D 16D
- * add(8) g2<1>D g7<8,8,1>D g8<8,8,1>D
- *
- * We avoid the shl instruction by realizing that we only want to add
- * the low 16-bits of the "high" result to the high 16-bits of the
- * "low" result and using proper regioning on the add:
- *
- * mul(8) g7<1>D g3<8,8,1>D g4.0<16,8,2>UW
- * mul(8) g8<1>D g3<8,8,1>D g4.1<16,8,2>UW
- * add(8) g7.1<2>UW g7.1<16,8,2>UW g8<16,8,2>UW
- *
- * Since it does not use the (single) accumulator register, we can
- * schedule multi-component multiplications much better.
+ if (inst->opcode == BRW_OPCODE_MUL) {
+ if (inst->dst.is_accumulator() ||
+ (inst->dst.type != BRW_REGISTER_TYPE_D &&
+ inst->dst.type != BRW_REGISTER_TYPE_UD))
+ continue;
+
+ /* Gen8's MUL instruction can do a 32-bit x 32-bit -> 32-bit
+ * operation directly, but CHV/BXT cannot.
*/
+ if (devinfo->gen >= 8 &&
+ !devinfo->is_cherryview && !devinfo->is_broxton)
+ continue;
- if (inst->conditional_mod && inst->dst.is_null()) {
- inst->dst = fs_reg(GRF, alloc.allocate(dispatch_width / 8),
- inst->dst.type);
- }
- fs_reg low = inst->dst;
- fs_reg high(GRF, alloc.allocate(dispatch_width / 8),
- inst->dst.type);
+ if (inst->src[1].file == IMM &&
+ inst->src[1].fixed_hw_reg.dw1.ud < (1 << 16)) {
+ /* The MUL instruction isn't commutative. On Gen <= 6, only the low
+ * 16-bits of src0 are read, and on Gen >= 7 only the low 16-bits of
+ * src1 are used.
+ *
+ * If multiplying by an immediate value that fits in 16-bits, do a
+ * single MUL instruction with that value in the proper location.
+ */
+ if (devinfo->gen < 7) {
+ fs_reg imm(GRF, alloc.allocate(dispatch_width / 8),
+ inst->dst.type);
+ ibld.MOV(imm, inst->src[1]);
+ ibld.MUL(inst->dst, imm, inst->src[0]);
+ } else {
+ ibld.MUL(inst->dst, inst->src[0], inst->src[1]);
+ }
+ } else {
+ /* Gen < 8 (and some Gen8+ low-power parts like Cherryview) cannot
+ * do 32-bit integer multiplication in one instruction, but instead
+ * must do a sequence (which actually calculates a 64-bit result):
+ *
+ * mul(8) acc0<1>D g3<8,8,1>D g4<8,8,1>D
+ * mach(8) null g3<8,8,1>D g4<8,8,1>D
+ * mov(8) g2<1>D acc0<8,8,1>D
+ *
+ * But on Gen > 6, the ability to use second accumulator register
+ * (acc1) for non-float data types was removed, preventing a simple
+ * implementation in SIMD16. A 16-channel result can be calculated by
+ * executing the three instructions twice in SIMD8, once with quarter
+ * control of 1Q for the first eight channels and again with 2Q for
+ * the second eight channels.
+ *
+ * Which accumulator register is implicitly accessed (by AccWrEnable
+ * for instance) is determined by the quarter control. Unfortunately
+ * Ivybridge (and presumably Baytrail) has a hardware bug in which an
+ * implicit accumulator access by an instruction with 2Q will access
+ * acc1 regardless of whether the data type is usable in acc1.
+ *
+ * Specifically, the 2Q mach(8) writes acc1 which does not exist for
+ * integer data types.
+ *
+ * Since we only want the low 32-bits of the result, we can do two
+ * 32-bit x 16-bit multiplies (like the mul and mach are doing), and
+ * adjust the high result and add them (like the mach is doing):
+ *
+ * mul(8) g7<1>D g3<8,8,1>D g4.0<8,8,1>UW
+ * mul(8) g8<1>D g3<8,8,1>D g4.1<8,8,1>UW
+ * shl(8) g9<1>D g8<8,8,1>D 16D
+ * add(8) g2<1>D g7<8,8,1>D g8<8,8,1>D
+ *
+ * We avoid the shl instruction by realizing that we only want to add
+ * the low 16-bits of the "high" result to the high 16-bits of the
+ * "low" result and using proper regioning on the add:
+ *
+ * mul(8) g7<1>D g3<8,8,1>D g4.0<16,8,2>UW
+ * mul(8) g8<1>D g3<8,8,1>D g4.1<16,8,2>UW
+ * add(8) g7.1<2>UW g7.1<16,8,2>UW g8<16,8,2>UW
+ *
+ * Since it does not use the (single) accumulator register, we can
+ * schedule multi-component multiplications much better.
+ */
- if (devinfo->gen >= 7) {
- fs_reg src1_0_w = inst->src[1];
- fs_reg src1_1_w = inst->src[1];
+ if (inst->conditional_mod && inst->dst.is_null()) {
+ inst->dst = fs_reg(GRF, alloc.allocate(dispatch_width / 8),
+ inst->dst.type);
+ }
+ fs_reg low = inst->dst;
+ fs_reg high(GRF, alloc.allocate(dispatch_width / 8),
+ inst->dst.type);
- if (inst->src[1].file == IMM) {
- src1_0_w.fixed_hw_reg.dw1.ud &= 0xffff;
- src1_1_w.fixed_hw_reg.dw1.ud >>= 16;
- } else {
- src1_0_w.type = BRW_REGISTER_TYPE_UW;
- if (src1_0_w.stride != 0) {
- assert(src1_0_w.stride == 1);
- src1_0_w.stride = 2;
+ if (devinfo->gen >= 7) {
+ fs_reg src1_0_w = inst->src[1];
+ fs_reg src1_1_w = inst->src[1];
+
+ if (inst->src[1].file == IMM) {
+ src1_0_w.fixed_hw_reg.dw1.ud &= 0xffff;
+ src1_1_w.fixed_hw_reg.dw1.ud >>= 16;
+ } else {
+ src1_0_w.type = BRW_REGISTER_TYPE_UW;
+ if (src1_0_w.stride != 0) {
+ assert(src1_0_w.stride == 1);
+ src1_0_w.stride = 2;
+ }
+
+ src1_1_w.type = BRW_REGISTER_TYPE_UW;
+ if (src1_1_w.stride != 0) {
+ assert(src1_1_w.stride == 1);
+ src1_1_w.stride = 2;
+ }
+ src1_1_w.subreg_offset += type_sz(BRW_REGISTER_TYPE_UW);
}
+ ibld.MUL(low, inst->src[0], src1_0_w);
+ ibld.MUL(high, inst->src[0], src1_1_w);
+ } else {
+ fs_reg src0_0_w = inst->src[0];
+ fs_reg src0_1_w = inst->src[0];
- src1_1_w.type = BRW_REGISTER_TYPE_UW;
- if (src1_1_w.stride != 0) {
- assert(src1_1_w.stride == 1);
- src1_1_w.stride = 2;
+ src0_0_w.type = BRW_REGISTER_TYPE_UW;
+ if (src0_0_w.stride != 0) {
+ assert(src0_0_w.stride == 1);
+ src0_0_w.stride = 2;
}
- src1_1_w.subreg_offset += type_sz(BRW_REGISTER_TYPE_UW);
- }
- ibld.MUL(low, inst->src[0], src1_0_w);
- ibld.MUL(high, inst->src[0], src1_1_w);
- } else {
- fs_reg src0_0_w = inst->src[0];
- fs_reg src0_1_w = inst->src[0];
- src0_0_w.type = BRW_REGISTER_TYPE_UW;
- if (src0_0_w.stride != 0) {
- assert(src0_0_w.stride == 1);
- src0_0_w.stride = 2;
- }
+ src0_1_w.type = BRW_REGISTER_TYPE_UW;
+ if (src0_1_w.stride != 0) {
+ assert(src0_1_w.stride == 1);
+ src0_1_w.stride = 2;
+ }
+ src0_1_w.subreg_offset += type_sz(BRW_REGISTER_TYPE_UW);
- src0_1_w.type = BRW_REGISTER_TYPE_UW;
- if (src0_1_w.stride != 0) {
- assert(src0_1_w.stride == 1);
- src0_1_w.stride = 2;
+ ibld.MUL(low, src0_0_w, inst->src[1]);
+ ibld.MUL(high, src0_1_w, inst->src[1]);
}
- src0_1_w.subreg_offset += type_sz(BRW_REGISTER_TYPE_UW);
- ibld.MUL(low, src0_0_w, inst->src[1]);
- ibld.MUL(high, src0_1_w, inst->src[1]);
- }
-
- fs_reg dst = inst->dst;
- dst.type = BRW_REGISTER_TYPE_UW;
- dst.subreg_offset = 2;
- dst.stride = 2;
+ fs_reg dst = inst->dst;
+ dst.type = BRW_REGISTER_TYPE_UW;
+ dst.subreg_offset = 2;
+ dst.stride = 2;
- high.type = BRW_REGISTER_TYPE_UW;
- high.stride = 2;
+ high.type = BRW_REGISTER_TYPE_UW;
+ high.stride = 2;
- low.type = BRW_REGISTER_TYPE_UW;
- low.subreg_offset = 2;
- low.stride = 2;
+ low.type = BRW_REGISTER_TYPE_UW;
+ low.subreg_offset = 2;
+ low.stride = 2;
- ibld.ADD(dst, low, high);
+ ibld.ADD(dst, low, high);
- if (inst->conditional_mod) {
- fs_reg null(retype(ibld.null_reg_f(), inst->dst.type));
- set_condmod(inst->conditional_mod,
- ibld.MOV(null, inst->dst));
+ if (inst->conditional_mod) {
+ fs_reg null(retype(ibld.null_reg_f(), inst->dst.type));
+ set_condmod(inst->conditional_mod,
+ ibld.MOV(null, inst->dst));
+ }
}
+ } else {
+ continue;
}
inst->remove(block);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 11:51:45 +0000