regmove.c (optimize_reg_copy_1): Don't try to replace call-used hard registers.

[gcc.git] / gcc / regmove.c

diff --git a/gcc/regmove.c b/gcc/regmove.c
index 5816831dc6cd94786674a7a63e3d325dc211a74b..5bd6f40e21f8d3501b0a7089874520b7e9d7961b 100644 (file)
--- a/gcc/regmove.c
+++ b/gcc/regmove.c
@@ -431,6 +431,9 @@ optimize_reg_copy_1 (rtx insn, rtx dest, rtx src)
          || (sregno < FIRST_PSEUDO_REGISTER
              && asm_noperands (PATTERN (p)) >= 0
              && reg_overlap_mentioned_p (src, PATTERN (p)))
+         /* Don't change hard registers used by a call.  */
+         || (CALL_P (p) && sregno < FIRST_PSEUDO_REGISTER
+             && find_reg_fusage (p, USE, src))
          /* Don't change a USE of a register.  */
          || (GET_CODE (PATTERN (p)) == USE
              && reg_overlap_mentioned_p (src, XEXP (PATTERN (p), 0))))