From 40b371a7c2fc7dca926f9b3a51ecf55e553711a8 Mon Sep 17 00:00:00 2001 From: Richard Sandiford Date: Wed, 13 Jan 2021 11:37:18 +0000 Subject: [PATCH] sh: Remove match_scratch operand test This patch fixes a regression on sh4 introduced by the rtl-ssa stuff. The port had a pattern: (define_insn "movsf_ie" [(set (match_operand:SF 0 "general_movdst_operand" "=f,r,f,f,fy, f,m, r, r,m,f,y,y,rf,r,y,<,y,y") (match_operand:SF 1 "general_movsrc_operand" " f,r,G,H,FQ,mf,f,FQ,mr,r,y,f,>,fr,y,r,y,>,y")) (use (reg:SI FPSCR_MODES_REG)) (clobber (match_scratch:SI 2 "=X,X,X,X,&z, X,X, X, X,X,X,X,X, y,X,X,X,X,X"))] "TARGET_SH2E && (arith_reg_operand (operands[0], SFmode) || fpul_operand (operands[0], SFmode) || arith_reg_operand (operands[1], SFmode) || fpul_operand (operands[1], SFmode) || arith_reg_operand (operands[2], SImode))" But recog can generate this pattern from something that matches: [(set (match_operand:SF 0 "general_movdst_operand") (match_operand:SF 1 "general_movsrc_operand") (use (reg:SI FPSCR_MODES_REG))] with recog adding the (clobber (match_scratch:SI)) automatically. recog tests the C condition before adding the clobber, so there might not be an operands[2] to test. Similarly, gen_movsf_ie takes only two arguments, with operand 2 being filled in automatically. The only way to create this pattern with a REG operands[2] before RA would be to generate it directly from RTL. AFAICT the only things that do this are the secondary reload patterns, which are generated during RA and come with pre-vetted operands. arith_reg_operand rejects 6 specific registers: return (regno != T_REG && regno != PR_REG && regno != FPUL_REG && regno != FPSCR_REG && regno != MACH_REG && regno != MACL_REG); The fpul_operand tests allow FPUL_REG, leaving 5 invalid registers. However, in all alternatives of movsf_ie, either operand 0 or operand 1 is a register that belongs r, f or y, none of which include any of the 5 rejected registers. This means that any post-RA pattern would satisfy the operands[0] or operands[1] condition without the operands[2] test being necessary. gcc/ * config/sh/sh.md (movsf_ie): Remove operands[2] test. --- gcc/config/sh/sh.md | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/gcc/config/sh/sh.md b/gcc/config/sh/sh.md index fe1231612ccd..e3af9ae21c1d 100644 --- a/gcc/config/sh/sh.md +++ b/gcc/config/sh/sh.md @@ -6067,8 +6067,7 @@ && (arith_reg_operand (operands[0], SFmode) || fpul_operand (operands[0], SFmode) || arith_reg_operand (operands[1], SFmode) - || fpul_operand (operands[1], SFmode) - || arith_reg_operand (operands[2], SImode))" + || fpul_operand (operands[1], SFmode))" "@ fmov %1,%0 mov %1,%0 -- 2.43.5