Author: void
Date: Tue Oct 2 16:43:06 2007
New Revision: 42552
URL: http://llvm.org/viewvc/llvm-project?rev=42552&view=rev
Log:
Another missed optimization with LICM.
Modified:
llvm/trunk/lib/Target/X86/README.txt
Modified: llvm/trunk/lib/Target/X86/README.txt
URL:
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/README.txt?rev=42552&r1=42551&r2=42552&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/README.txt (original)
+++ llvm/trunk/lib/Target/X86/README.txt Tue Oct 2 16:43:06 2007
@@ -1283,3 +1283,26 @@
//===---------------------------------------------------------------------===//
+For this code:
+
+cond_next603: ; preds = %bb493, %cond_true336, %cond_next599
+ %v.21050.1 = phi i32 [ %v.21050.0, %cond_next599 ], [ %tmp344,
%cond_true336 ], [ %v.2, %bb493 ] ; <i32> [#uses=1]
+ %maxz.21051.1 = phi i32 [ %maxz.21051.0, %cond_next599 ], [ 0,
%cond_true336 ], [ %maxz.2, %bb493 ] ; <i32> [#uses=2]
+ %cnt.01055.1 = phi i32 [ %cnt.01055.0, %cond_next599 ], [ 0,
%cond_true336 ], [ %cnt.0, %bb493 ] ; <i32> [#uses=2]
+ %byteptr.9 = phi i8* [ %byteptr.12, %cond_next599 ], [ %byteptr.0,
%cond_true336 ], [ %byteptr.10, %bb493 ] ; <i8*> [#uses=9]
+ %bitptr.6 = phi i32 [ %tmp5571104.1, %cond_next599 ], [ %tmp4921049,
%cond_true336 ], [ %bitptr.7, %bb493 ] ; <i32> [#uses=4]
+ %source.5 = phi i32 [ %tmp602, %cond_next599 ], [ %source.0,
%cond_true336 ], [ %source.6, %bb493 ] ; <i32> [#uses=7]
+ %tmp606 = getelementptr %struct.const_tables* @tables, i32 0, i32 0,
i32 %cnt.01055.1 ; <i8*> [#uses=1]
+ %tmp607 = load i8* %tmp606, align 1 ; <i8> [#uses=1]
+
+We produce this:
+
+LBB4_70: # cond_next603
+ movl -20(%ebp), %esi
+ movl L_tables$non_lazy_ptr-"L4$pb"(%esi), %esi
+
+However, ICC caches this information before the loop and produces this:
+
+ movl 88(%esp), %eax #481.12
+
+//===---------------------------------------------------------------------===//
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