diff options
| author | Maciej W. Rozycki <macro@linux-mips.org> | 2020-12-05 18:26:27 +0000 |
|---|---|---|
| committer | Maciej W. Rozycki <macro@linux-mips.org> | 2020-12-05 18:26:27 +0000 |
| commit | c60d0736dff72af730261483945b1a7cfd2a0021 (patch) | |
| tree | 77fb68b8bd9ff8b8d564a9ad36bb51236b87e882 /gcc | |
| parent | 20ab43b5cad6ac69a70b01489be0adf98bd421ba (diff) | |
| download | gcc-c60d0736dff72af730261483945b1a7cfd2a0021.zip gcc-c60d0736dff72af730261483945b1a7cfd2a0021.tar.gz gcc-c60d0736dff72af730261483945b1a7cfd2a0021.tar.bz2 | |
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.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/pdp11/pdp11.md | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/gcc/config/pdp11/pdp11.md b/gcc/config/pdp11/pdp11.md index 7a4d50f..cdef49f 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") |