Changes in directory llvm/lib/Target/X86:
README.txt updated: 1.138 -> 1.139
---
Log message:
implemented
---
Diffs of the changes: (+0 -35)
README.txt | 35 -----------------------------------
1 files changed, 35 deletions(-)
Index: llvm/lib/Target/X86/README.txt
diff -u llvm/lib/Target/X86/README.txt:1.138
llvm/lib/Target/X86/README.txt:1.139
--- llvm/lib/Target/X86/README.txt:1.138 Thu Sep 21 00:46:00 2006
+++ llvm/lib/Target/X86/README.txt Thu Sep 21 01:14:54 2006
@@ -642,41 +642,6 @@
//===---------------------------------------------------------------------===//
-Compile:
-int %test(ulong *%tmp) {
- %tmp = load ulong* %tmp ; <ulong> [#uses=1]
- %tmp.mask = shr ulong %tmp, ubyte 50 ; <ulong> [#uses=1]
- %tmp.mask = cast ulong %tmp.mask to ubyte
- %tmp2 = and ubyte %tmp.mask, 3 ; <ubyte> [#uses=1]
- %tmp2 = cast ubyte %tmp2 to int ; <int> [#uses=1]
- ret int %tmp2
-}
-
-to:
-
-_test:
- movl 4(%esp), %eax
- movl 4(%eax), %eax
- shrl $18, %eax
- andl $3, %eax
- ret
-
-instead of:
-
-_test:
- movl 4(%esp), %eax
- movl 4(%eax), %eax
- shrl $18, %eax
- # TRUNCATE movb %al, %al
- andb $3, %al
- movzbl %al, %eax
- ret
-
-This saves a movzbl, and saves a truncate if it doesn't get coallesced right.
-This is a simple DAGCombine to propagate the zext through the and.
-
-//===---------------------------------------------------------------------===//
-
GCC's ix86_expand_int_movcc function (in i386.c) has a ton of interesting
simplifications for integer "x cmp y ? a : b". For example, instead of:
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