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authorChris Lattner <sabre@nondot.org>2007-03-31 07:06:25 +0000
committerChris Lattner <sabre@nondot.org>2007-03-31 07:06:25 +0000
commitfcb1e61a4375c4bdb015aafcec559fc8e577da99 (patch)
tree0ddf4ce6714172a8d2830fcae458159828eba956 /lib/Target/PowerPC/README.txt
parentc8d288f8fa9e46199a29e1954550c980f184bd1c (diff)
add a note
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35530 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/PowerPC/README.txt')
-rw-r--r--lib/Target/PowerPC/README.txt23
1 files changed, 23 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/README.txt b/lib/Target/PowerPC/README.txt
index 864302f687..69e60fcb92 100644
--- a/lib/Target/PowerPC/README.txt
+++ b/lib/Target/PowerPC/README.txt
@@ -639,3 +639,26 @@ __ZNK4llvm5APInt17countLeadingZerosEv:
The dead or is a 'truncate' from 64- to 32-bits.
===-------------------------------------------------------------------------===
+
+We generate horrible ppc code for this:
+
+#define N 2000000
+double a[N],c[N];
+void simpleloop() {
+ int j;
+ for (j=0; j<N; j++)
+ c[j] = a[j];
+}
+
+LBB1_1: ;bb
+ lfdx f0, r3, r4
+ addi r5, r5, 1 ;; Extra IV for the exit value compare.
+ stfdx f0, r2, r4
+ addi r4, r4, 8
+
+ xoris r6, r5, 30 ;; This is due to a large immediate.
+ cmplwi cr0, r6, 33920
+ bne cr0, LBB1_1
+
+===-------------------------------------------------------------------------===
+