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fd3daa74c2
C is not a low-bits mask, and add a similar instcombine for zext((trunc(t) & C) ^ C). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73705 91177308-0d34-0410-b5e6-96231b3b80d8
39 lines
799 B
LLVM
39 lines
799 B
LLVM
; RUN: llvm-as < %s | opt -instcombine | llvm-dis > %t
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; RUN: not grep zext %t
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; RUN: not grep sext %t
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; Instcombine should be able to eliminate all of these ext casts.
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declare void @use(i32)
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define i64 @foo(i64 %a) {
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%b = trunc i64 %a to i32
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%c = and i32 %b, 15
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%d = zext i32 %c to i64
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call void @use(i32 %b)
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ret i64 %d
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}
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define i64 @bar(i64 %a) {
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%b = trunc i64 %a to i32
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%c = shl i32 %b, 4
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%q = ashr i32 %c, 4
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%d = sext i32 %q to i64
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call void @use(i32 %b)
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ret i64 %d
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}
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define i64 @goo(i64 %a) {
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%b = trunc i64 %a to i32
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%c = and i32 %b, 8
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%d = zext i32 %c to i64
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call void @use(i32 %b)
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ret i64 %d
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}
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define i64 @hoo(i64 %a) {
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%b = trunc i64 %a to i32
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%c = and i32 %b, 8
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%x = xor i32 %c, 8
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%d = zext i32 %x to i64
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call void @use(i32 %b)
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ret i64 %d
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}
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