add a note
llvm-svn: 27828
diff --git a/llvm/lib/Target/PowerPC/README_ALTIVEC.txt b/llvm/lib/Target/PowerPC/README_ALTIVEC.txt
index 886723d..b667ecb 100644
--- a/llvm/lib/Target/PowerPC/README_ALTIVEC.txt
+++ b/llvm/lib/Target/PowerPC/README_ALTIVEC.txt
@@ -108,3 +108,33 @@
//===----------------------------------------------------------------------===//
+The code generated for this is truly aweful:
+
+vector float test(float a, float b) {
+ return (vector float){ 0.0, a, 0.0, 0.0};
+}
+
+LCPI1_0: ; float
+ .space 4
+ .text
+ .globl _test
+ .align 4
+_test:
+ mfspr r2, 256
+ oris r3, r2, 4096
+ mtspr 256, r3
+ lis r3, ha16(LCPI1_0)
+ addi r4, r1, -32
+ stfs f1, -16(r1)
+ addi r5, r1, -16
+ lfs f0, lo16(LCPI1_0)(r3)
+ stfs f0, -32(r1)
+ lvx v2, 0, r4
+ lvx v3, 0, r5
+ vmrghw v3, v3, v2
+ vspltw v2, v2, 0
+ vmrghw v2, v2, v3
+ mtspr 256, r2
+ blr
+
+//===----------------------------------------------------------------------===//