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-rw-r--r--src/mesa/shader/program.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/src/mesa/shader/program.c b/src/mesa/shader/program.c
index 532adf4d36..6b8d94e661 100644
--- a/src/mesa/shader/program.c
+++ b/src/mesa/shader/program.c
@@ -806,9 +806,17 @@ _mesa_find_free_register(const struct gl_program *prog, GLuint regFile)
const struct prog_instruction *inst = prog->Instructions + i;
const GLuint n = _mesa_num_inst_src_regs(inst->Opcode);
- for (k = 0; k < n; k++) {
- if (inst->SrcReg[k].File == regFile) {
- used[inst->SrcReg[k].Index] = GL_TRUE;
+ /* check dst reg first */
+ if (inst->DstReg.File == regFile) {
+ used[inst->DstReg.Index] = GL_TRUE;
+ }
+ else {
+ /* check src regs otherwise */
+ for (k = 0; k < n; k++) {
+ if (inst->SrcReg[k].File == regFile) {
+ used[inst->SrcReg[k].Index] = GL_TRUE;
+ break;
+ }
}
}
}