diff options
Diffstat (limited to 'gcc/reg-stack.c')
| -rw-r--r-- | gcc/reg-stack.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/gcc/reg-stack.c b/gcc/reg-stack.c index 8413ca3a399..0103a2f0475 100644 --- a/gcc/reg-stack.c +++ b/gcc/reg-stack.c @@ -1759,7 +1759,7 @@ subst_stack_regs_pat (rtx insn, stack regstack, rtx pat) case UNSPEC_FSCALE_FRACT: case UNSPEC_FPREM_F: case UNSPEC_FPREM1_F: - /* These insns operate on the top two stack slots. + /* These insns operate on the top two stack slots, first part of double input, double output insn. */ src1 = get_true_reg (&XVECEXP (pat_src, 0, 0)); @@ -1791,22 +1791,12 @@ subst_stack_regs_pat (rtx insn, stack regstack, rtx pat) case UNSPEC_FSCALE_EXP: case UNSPEC_FPREM_U: case UNSPEC_FPREM1_U: - /* These insns operate on the top two stack slots./ + /* These insns operate on the top two stack slots, second part of double input, double output insn. */ src1 = get_true_reg (&XVECEXP (pat_src, 0, 0)); src2 = get_true_reg (&XVECEXP (pat_src, 0, 1)); - src1_note = find_regno_note (insn, REG_DEAD, REGNO (*src1)); - src2_note = find_regno_note (insn, REG_DEAD, REGNO (*src2)); - - /* Inputs should never die, they are - replaced with outputs. */ - gcc_assert (!src1_note); - gcc_assert (!src2_note); - - swap_to_top (insn, regstack, *src1, *src2); - /* Push the result back onto stack. Fill empty slot from first part of insn and fix top of stack pointer. */ if (STACK_REG_P (*dest)) @@ -1820,6 +1810,17 @@ subst_stack_regs_pat (rtx insn, stack regstack, rtx pat) replace_reg (src2, FIRST_STACK_REG + 1); break; + case UNSPEC_C2_FLAG: + /* This insn operates on the top two stack slots, + third part of C2 setting double input insn. */ + + src1 = get_true_reg (&XVECEXP (pat_src, 0, 0)); + src2 = get_true_reg (&XVECEXP (pat_src, 0, 1)); + + replace_reg (src1, FIRST_STACK_REG); + replace_reg (src2, FIRST_STACK_REG + 1); + break; + case UNSPEC_SAHF: /* (unspec [(unspec [(compare)] UNSPEC_FNSTSW)] UNSPEC_SAHF) The combination matches the PPRO fcomi instruction. */ |