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authorDan Gohman <gohman@apple.com>2009-06-18 16:30:21 +0000
committerDan Gohman <gohman@apple.com>2009-06-18 16:30:21 +0000
commit56bd02c55c7e512e140003015ab201441ef9eeac (patch)
tree6433461d2c858fffd3658795b388e4e04204a14c /llvm/test/Transforms/InstCombine/trunc-mask-ext.ll
parent5a728c908c556d72d4ef9c6355a21073cdfb76c2 (diff)
downloadbcm5719-llvm-56bd02c55c7e512e140003015ab201441ef9eeac.tar.gz
bcm5719-llvm-56bd02c55c7e512e140003015ab201441ef9eeac.zip
Generalize the zext(trunc(t) & C) instcombine to work even with
C is not a low-bits mask, and add a similar instcombine for zext((trunc(t) & C) ^ C). llvm-svn: 73705
Diffstat (limited to 'llvm/test/Transforms/InstCombine/trunc-mask-ext.ll')
-rw-r--r--llvm/test/Transforms/InstCombine/trunc-mask-ext.ll17
1 files changed, 16 insertions, 1 deletions
diff --git a/llvm/test/Transforms/InstCombine/trunc-mask-ext.ll b/llvm/test/Transforms/InstCombine/trunc-mask-ext.ll
index 1499947cc07..7e3d8446acf 100644
--- a/llvm/test/Transforms/InstCombine/trunc-mask-ext.ll
+++ b/llvm/test/Transforms/InstCombine/trunc-mask-ext.ll
@@ -2,7 +2,7 @@
; RUN: not grep zext %t
; RUN: not grep sext %t
-; Instcombine should be able to eliminate both ext casts.
+; Instcombine should be able to eliminate all of these ext casts.
declare void @use(i32)
@@ -21,3 +21,18 @@ define i64 @bar(i64 %a) {
call void @use(i32 %b)
ret i64 %d
}
+define i64 @goo(i64 %a) {
+ %b = trunc i64 %a to i32
+ %c = and i32 %b, 8
+ %d = zext i32 %c to i64
+ call void @use(i32 %b)
+ ret i64 %d
+}
+define i64 @hoo(i64 %a) {
+ %b = trunc i64 %a to i32
+ %c = and i32 %b, 8
+ %x = xor i32 %c, 8
+ %d = zext i32 %x to i64
+ call void @use(i32 %b)
+ ret i64 %d
+}
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