From 5b974a922aaf0de3596b887173d1ee109b0e5723 Mon Sep 17 00:00:00 2001
From: Georg Lehmann <dadschoorse@gmail.com>
Date: Wed, 25 Feb 2026 14:56:51 +0100
Subject: [PATCH] nir: print all fp_math_ctrl bits

Examples:
div 32    %338 = ffma %89, %328.z, %335 // exact, preserve:sz,inf,nan
con 32    %28 = fmul %17.y, %27 (2.000000) // preserve:sz,inf,nan

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40093>
---
 src/compiler/nir/nir_print.c | 42 ++++++++++++++++++++++++++++++++++--
 1 file changed, 40 insertions(+), 2 deletions(-)

diff --git a/src/compiler/nir/nir_print.c b/src/compiler/nir/nir_print.c
index f967a1afe15..cb38dd285d6 100644
--- a/src/compiler/nir/nir_print.c
+++ b/src/compiler/nir/nir_print.c
@@ -481,6 +481,41 @@ print_alu_src(nir_alu_instr *instr, unsigned src, print_state *state)
    }
 }
 
+static void
+print_fp_math_ctrl(unsigned fp_math_ctrl, print_state *state)
+{
+   FILE *fp = state->fp;
+
+   if (fp_math_ctrl & nir_fp_exact) {
+      fprintf(fp, "exact");
+      if (fp_math_ctrl & ~nir_fp_exact)
+         fprintf(fp, ", ");
+   }
+
+   if (fp_math_ctrl & nir_fp_preserve_sz_inf_nan) {
+      fprintf(fp, "preserve:");
+
+      static const struct {
+         nir_fp_math_control bit;
+         const char *name;
+      } preserve_bits[] = {
+         { nir_fp_preserve_signed_zero, "sz" },
+         { nir_fp_preserve_inf, "inf" },
+         { nir_fp_preserve_nan, "nan" },
+      };
+
+      bool first = true;
+      for (unsigned i = 0; i < ARRAY_SIZE(preserve_bits); i++) {
+         if (fp_math_ctrl & preserve_bits[i].bit) {
+            if (!first)
+               fprintf(fp, ",");
+            first = false;
+            fprintf(fp, "%s", preserve_bits[i].name);
+         }
+      }
+   }
+}
+
 static void
 print_alu_instr(nir_alu_instr *instr, print_state *state)
 {
@@ -489,8 +524,6 @@ print_alu_instr(nir_alu_instr *instr, print_state *state)
    print_def(&instr->def, state);
 
    fprintf(fp, " = %s", nir_op_infos[instr->op].name);
-   if (nir_alu_instr_is_exact(instr))
-      fprintf(fp, "!");
    if (instr->no_signed_wrap)
       fprintf(fp, ".nsw");
    if (instr->no_unsigned_wrap)
@@ -503,6 +536,11 @@ print_alu_instr(nir_alu_instr *instr, print_state *state)
 
       print_alu_src(instr, i, state);
    }
+
+   if (instr->fp_math_ctrl) {
+      fprintf(fp, " // ");
+      print_fp_math_ctrl(instr->fp_math_ctrl, state);
+   }
 }
 
 static const char *