From c60d0736dff72af730261483945b1a7cfd2a0021 Mon Sep 17 00:00:00 2001 From: "Maciej W. Rozycki" Date: Sat, 5 Dec 2020 18:26:27 +0000 Subject: [PATCH] PDP11: Use `const_double_zero' to express double zero constant We do not define a comparison operation between floating-point and integer data, including integer zero constant. Consequently the RTL instruction stream presented to the post-reload comparison elimination pass will include, where applicable, floating-point comparison insns against `const_double:DF 0.0 [0x0.0p+0]' rather than `const_int 0 [0]', meaning that the latter expression will not match when used in machine description. Use `const_double_zero' then for the relevant patterns to match the intended RTL instructions. gcc/ * config/pdp11/pdp11.md (fcc_cc, fcc_ccnz): Use `const_double_zero' to express double zero constant. --- gcc/config/pdp11/pdp11.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/gcc/config/pdp11/pdp11.md b/gcc/config/pdp11/pdp11.md index 7a4d50fdba9..cdef49f3979 100644 --- a/gcc/config/pdp11/pdp11.md +++ b/gcc/config/pdp11/pdp11.md @@ -105,7 +105,7 @@ (clobber (reg FCC_REGNUM))] "" [(set (reg:CC FCC_REGNUM) - (compare:CC (match_dup 1) (const_int 0))) + (compare:CC (match_dup 1) (const_double_zero))) (set (match_dup 0) (match_dup 1))]) (define_subst "fcc_ccnz" @@ -113,7 +113,7 @@ (clobber (reg FCC_REGNUM))] "" [(set (reg:CCNZ FCC_REGNUM) - (compare:CCNZ (match_dup 1) (const_int 0))) + (compare:CCNZ (match_dup 1) (const_double_zero))) (set (match_dup 0) (match_dup 1))]) (define_subst_attr "cc_cc" "cc_cc" "_nocc" "_cc")