diff --git a/src/compiler/spirv/vtn_alu.c b/src/compiler/spirv/vtn_alu.c
index 31d8a230211..8d2256055f5 100644
--- a/src/compiler/spirv/vtn_alu.c
+++ b/src/compiler/spirv/vtn_alu.c
@@ -451,6 +451,9 @@ vtn_handle_fp_fast_math(struct vtn_builder *b, struct vtn_value *val)
    }
 
    vtn_foreach_decoration(b, val, handle_fp_fast_math, NULL);
+
+   if (b->exact || vtn_has_decoration(b, val, SpvDecorationNoContraction))
+      b->nb.fp_math_ctrl |= nir_fp_exact;
 }
 
 nir_rounding_mode
@@ -729,8 +732,6 @@ vtn_handle_alu(struct vtn_builder *b, SpvOp opcode,
 
    vtn_handle_fp_fast_math(b, dest_val);
 
-   if (b->exact || vtn_has_decoration(b, dest_val, SpvDecorationNoContraction))
-      b->nb.fp_math_ctrl |= nir_fp_exact;
    bool mediump_16bit = vtn_alu_op_mediump_16bit(b, opcode, dest_val);
 
    /* Collect the various SSA sources */
diff --git a/src/compiler/spirv/vtn_glsl450.c b/src/compiler/spirv/vtn_glsl450.c
index 486f637344e..fe81c34c4bd 100644
--- a/src/compiler/spirv/vtn_glsl450.c
+++ b/src/compiler/spirv/vtn_glsl450.c
@@ -325,8 +325,6 @@ handle_glsl450_alu(struct vtn_builder *b, enum GLSLstd450 entrypoint,
 
    struct vtn_ssa_value *dest = vtn_create_ssa_value(b, dest_type);
 
-   if (b->exact || vtn_has_decoration(b, dest_val, SpvDecorationNoContraction))
-      b->nb.fp_math_ctrl |= nir_fp_exact;
    switch (entrypoint) {
    case GLSLstd450Radians:
       dest->def = nir_radians(nb, src[0]);
@@ -637,7 +635,6 @@ handle_glsl450_alu(struct vtn_builder *b, enum GLSLstd450 entrypoint,
       break;
    }
    }
-   b->nb.fp_math_ctrl = b->exact ? nir_fp_exact : nir_fp_fast_math;
 
    if (mediump_16bit)
       vtn_mediump_upconvert_value(b, dest);
@@ -734,7 +731,9 @@ vtn_handle_glsl450_instruction(struct vtn_builder *b, SpvOp ext_opcode,
 
    default:
       handle_glsl450_alu(b, (enum GLSLstd450)ext_opcode, w, count);
+      break;
    }
 
+   b->nb.fp_math_ctrl = b->exact ? nir_fp_exact : nir_fp_fast_math;
    return true;
 }