[llvm-commits] CVS: llvm/lib/Target/X86/README.txt

[Chris Lattner]

Changes in directory llvm/lib/Target/X86:

README.txt updated: 1.30 -> 1.31
---
Log message:

add some notes


---
Diffs of the changes:  (+24 -0)

 README.txt |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+)


Index: llvm/lib/Target/X86/README.txt
diff -u llvm/lib/Target/X86/README.txt:1.30 llvm/lib/Target/X86/README.txt:1.31
--- llvm/lib/Target/X86/README.txt:1.30	Sun Jan 29 03:46:06 2006
+++ llvm/lib/Target/X86/README.txt	Mon Jan 30 18:20:38 2006
@@ -286,3 +286,27 @@
 
 When compiled with unsafemath enabled, "main" should enable SSE DAZ mode and
 other fast SSE modes.
+
+//===---------------------------------------------------------------------===//
+
+cd Regression/CodeGen/X86
+llvm-as < setuge.ll | llc -march=x86 -mcpu=yonah -enable-x86-sse
+
+_cmp:
+        subl $4, %esp
+1)      leal 20(%esp), %eax
+        movss 12(%esp), %xmm0
+1)      leal 16(%esp), %ecx
+        ucomiss 8(%esp), %xmm0
+        cmovb %ecx, %eax
+2)      movss (%eax), %xmm0
+2)      movss %xmm0, (%esp)
+        flds (%esp)
+        addl $4, %esp
+        ret
+
+
+1) These LEA's should be adds.  This is tricky because they are FrameIndex's
+   before prolog-epilog rewriting.
+2) We shouldn't load into XMM regs only to store it back.
+