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| author | Jim Wilson <wilson@cygnus.com> | 1997-08-29 15:19:58 +0000 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1997-08-29 09:19:58 -0600 |
| commit | 575833386fa593c86f362bc385b89ee410895328 (patch) | |
| tree | a6431ac65bced6119c4b53601cb7fdf5967fea9b | |
| parent | 4f91a0f87a988b3a4efbcdabbaa9e92a42676e69 (diff) | |
| download | gcc-575833386fa593c86f362bc385b89ee410895328.zip gcc-575833386fa593c86f362bc385b89ee410895328.tar.gz gcc-575833386fa593c86f362bc385b89ee410895328.tar.bz2 | |
m68k.md (iorsi_zexthi_ashl16): Disable.
* m68k/m68k.md (iorsi_zexthi_ashl16): Disable.
Fixes m68k codegen problem.
From-SVN: r14996
| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/config/m68k/m68k.md | 11 |
2 files changed, 14 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index aba37c0..d7c2e50 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,7 @@ +Thu Aug 28 15:14:46 1997 Jim Wilson <wilson@cygnus.com> + + * m68k/m68k.md (iorsi_zexthi_ashl16): Disable. + 1997-08-27 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * Makefile.in (config.status): Depend on version.c diff --git a/gcc/config/m68k/m68k.md b/gcc/config/m68k/m68k.md index 456b277..2413c64 100644 --- a/gcc/config/m68k/m68k.md +++ b/gcc/config/m68k/m68k.md @@ -3733,12 +3733,21 @@ ;; On all 68k models, this makes faster code in a special case. ;; See also ashlsi_16, ashrsi_16 and lshrsi_16. +;; ??? This pattern can not work as written, because it fails if operand 0 +;; and operand 1 are the same register. This can happen for alternative 1. +;; This will still fail even if an early clobber is added to the output +;; for alternative 1. This is because reload may satisfy the matching +;; constraint by forcing the output to use exactly the same register as +;; operand 2, without noticing that this then causes a conflict with operand 1. +;; Possible fix: check for operand 0/1 overlap, and emit correct but slower +;; code. This should be rare if the early clobber is added. + (define_insn "iorsi_zexthi_ashl16" [(set (match_operand:SI 0 "general_operand" "=&d,d") (ior:SI (zero_extend:SI (match_operand:HI 1 "general_operand" "dmn,dmn")) (ashift:SI (match_operand:SI 2 "general_operand" "o,0") (const_int 16))))] - "" + "0" "* { CC_STATUS_INIT; |