[Bug target/53110] GCC-4.7 generates stupid x86_64 asm

peterz at infradead dot org gcc-bugzilla@gcc.gnu.org
Wed Apr 25 13:16:00 GMT 2012


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53110

--- Comment #8 from peterz at infradead dot org 2012-04-25 13:15:56 UTC ---
Jakub's patch seems to improve the situation:

--- gcc-bug-4.7.s       2012-04-25 14:58:21.494815266 +0200
+++ gcc-bug-4.7+.s      2012-04-25 15:14:13.784243427 +0200
@@ -22,12 +22,12 @@
        .cfi_startproc
        movq    %rdi, %r8
        movq    %rsi, %r9
-       andl    $4294967295, %esi
+       movl    %esi, %esi
        shrq    $32, %r9
        shrq    $32, %r8
        movq    %rsi, %rdx
        imulq   %r8, %rdx
-       andl    $4294967295, %edi
+       movl    %edi, %edi
        movq    %r9, %rax
        imulq   %rdi, %rax
        imulq   %r9, %r8



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