[llvm-commits] [llvm] r42024 - in /llvm/trunk: lib/Target/X86/X86InstrX86-64.td test/CodeGen/X86/cmp0.ll

[Dan Gohman]

Author: djg
Date: Mon Sep 17 09:35:24 2007
New Revision: 42024

URL: http://llvm.org/viewvc/llvm-project?rev=42024&view=rev
Log:
Use "test reg,reg" in place of "cmp reg,0" for 64-bit operands. This was
previously only done for 32-bit and smaller operands.

Added:
    llvm/trunk/test/CodeGen/X86/cmp0.ll
Modified:
    llvm/trunk/lib/Target/X86/X86InstrX86-64.td

Modified: llvm/trunk/lib/Target/X86/X86InstrX86-64.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86InstrX86-64.td?rev=42024&r1=42023&r2=42024&view=diff

==============================================================================
--- llvm/trunk/lib/Target/X86/X86InstrX86-64.td (original)
+++ llvm/trunk/lib/Target/X86/X86InstrX86-64.td Mon Sep 17 09:35:24 2007
@@ -1076,6 +1076,12 @@
 def : Pat<(X86tailcall GR64:$dst),
           (CALL64r GR64:$dst)>;
 
+// Comparisons.
+
+// TEST R,R is smaller than CMP R,0
+def : Pat<(X86cmp GR64:$src1, 0),
+          (TEST64rr GR64:$src1, GR64:$src1)>;
+
 // {s|z}extload bool -> {s|z}extload byte
 def : Pat<(sextloadi64i1 addr:$src), (MOVSX64rm8 addr:$src)>;
 def : Pat<(zextloadi64i1 addr:$src), (MOVZX64rm8 addr:$src)>;

Added: llvm/trunk/test/CodeGen/X86/cmp0.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/cmp0.ll?rev=42024&view=auto

==============================================================================
--- llvm/trunk/test/CodeGen/X86/cmp0.ll (added)
+++ llvm/trunk/test/CodeGen/X86/cmp0.ll Mon Sep 17 09:35:24 2007
@@ -0,0 +1,7 @@
+; RUN: llvm-as < %s | llc -march=x86-64 | grep -v cmp
+
+define i64 @foo(i64 %x) {
+  %t = icmp eq i64 %x, 0
+  %r = zext i1 %t to i64
+  ret i64 %r
+}