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[i386] : Remove mixed-mode x87 absneg patterns

Message ID CAFULd4aq5k0CjVHTgf3bEm97uk=e_W6y_u==TWOFQbimkbZXnA@mail.gmail.com
State New
Headers show
Series [i386] : Remove mixed-mode x87 absneg patterns | expand

Commit Message

Uros Bizjak Oct. 3, 2018, 6:33 p.m. UTC 
Hello!

These are not needed, an explicit no-op float-extend will be emitted.
The extension degrades to an ordinary move or a no-op in regstack
pass, resulting in exactly the same assembly.

2018-10-03  Uros Bizjak  <ubizjak@gmail.com>

    * config/i386/i386.md (*<absneg:code>extendsfdf2): Remove.
    (*<absneg:code>extend<mode>xf2): Ditto.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Committed to mainline SVN.

Uros.
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Patch

diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 367e9bfe255b..7a85b464f7aa 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -920,7 +920,7 @@ 
 (define_code_iterator absneg [abs neg])
 
 ;; Base name for x87 insn mnemonic.
-(define_code_attr absneg_mnemonic [(abs "abs") (neg "chs")])
+(define_code_attr absneg_mnemonic [(abs "fabs") (neg "fchs")])
 
 ;; Used in signed and unsigned widening multiplications.
 (define_code_iterator any_extend [sign_extend zero_extend])
@@ -9796,28 +9796,10 @@ 
   "TARGET_80387
    && (reload_completed
        || !(SSE_FLOAT_MODE_P (<MODE>mode) && TARGET_SSE_MATH))"
-  "f<absneg_mnemonic>"
+  "<absneg_mnemonic>"
   [(set_attr "type" "fsgn")
    (set_attr "mode" "<MODE>")])
 
-(define_insn "*<code>extendsfdf2"
-  [(set (match_operand:DF 0 "register_operand" "=f")
-	(absneg:DF (float_extend:DF
-		     (match_operand:SF 1 "register_operand" "0"))))]
-  "TARGET_80387 && (!TARGET_SSE_MATH || TARGET_MIX_SSE_I387)"
-  "f<absneg_mnemonic>"
-  [(set_attr "type" "fsgn")
-   (set_attr "mode" "DF")])
-
-(define_insn "*<code>extend<mode>xf2"
-  [(set (match_operand:XF 0 "register_operand" "=f")
-	(absneg:XF (float_extend:XF
-		     (match_operand:MODEF 1 "register_operand" "0"))))]
-  "TARGET_80387"
-  "f<absneg_mnemonic>"
-  [(set_attr "type" "fsgn")
-   (set_attr "mode" "XF")])
-
 ;; Copysign instructions
 
 (define_mode_iterator CSGNMODE [SF DF TF])