Changes in directory llvm/lib/Target/X86:
README.txt updated: 1.140 -> 1.141
---
Log message:
ugly codegen
---
Diffs of the changes: (+22 -0)
README.txt | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+)
Index: llvm/lib/Target/X86/README.txt
diff -u llvm/lib/Target/X86/README.txt:1.140
llvm/lib/Target/X86/README.txt:1.141
--- llvm/lib/Target/X86/README.txt:1.140 Fri Oct 6 03:21:07 2006
+++ llvm/lib/Target/X86/README.txt Fri Oct 6 12:39:34 2006
@@ -711,4 +711,26 @@
into x.h == 0
+//===---------------------------------------------------------------------===//
+We currently compile sign_extend_inreg into two shifts:
+
+long foo(long X) {
+ return (long)(signed char)X;
+}
+
+becomes:
+
+_foo:
+ movl 4(%esp), %eax
+ shll $24, %eax
+ sarl $24, %eax
+ ret
+
+This could be:
+
+_foo:
+ movsbl 4(%esp),%eax
+ ret
+
+//===---------------------------------------------------------------------===//
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