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nir: improve fsqrt range analysis

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Foz-DB Navi21:
Totals from 3 (0.00% of 79377) affected shaders:
MaxWaves: 88 -> 96 (+9.09%)
Instrs: 1058 -> 951 (-10.11%)
CodeSize: 5964 -> 5368 (-9.99%)
VGPRs: 104 -> 96 (-7.69%)
Latency: 15283 -> 14099 (-7.75%); split: -8.37%, +0.62%
InvThroughput: 4951 -> 4238 (-14.40%)
Copies: 81 -> 76 (-6.17%)
PreVGPRs: 93 -> 84 (-9.68%)
VALU: 820 -> 737 (-10.12%)
SALU: 115 -> 91 (-20.87%)

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33557>
This commit is contained in:
Georg Lehmann
2025-02-14 20:13:58 +01:00
committed by Marge Bot
parent 81b4629636
commit 317d07484e
1 changed files with 17 additions and 2 deletions
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src/compiler/nir/nir_range_analysis.c
+17 -2
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@@ -594,6 +594,7 @@ process_fp_query(struct analysis_state *state, struct analysis_query *aq, uint32
case nir_op_fabs:
case nir_op_fexp2:
case nir_op_frcp:
case nir_op_fsqrt:
case nir_op_frsq:
case nir_op_fneg:
case nir_op_fsat:
@@ -1122,9 +1123,23 @@ process_fp_query(struct analysis_state *state, struct analysis_query *aq, uint32
};
break;
case nir_op_fsqrt:
r = (struct ssa_result_range){ ge_zero, false, false, false };
case nir_op_fsqrt: {
const struct ssa_result_range left = unpack_data(src_res[0]);
/* sqrt(NaN) and sqrt(< 0) is NaN. */
if (left.range == eq_zero || left.range == ge_zero || left.range == gt_zero) {
r.is_a_number = left.is_a_number;
/* Only sqrt(Inf) is Inf. */
r.is_finite = left.is_finite;
}
if (left.range == gt_zero || left.range == ne_zero)
r.range = gt_zero;
else
r.range = ge_zero;
break;
}
case nir_op_frsq: {
const struct ssa_result_range left = unpack_data(src_res[0]);