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| author | Chris Lattner <sabre@nondot.org> | 2010-08-27 20:32:06 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-08-27 20:32:06 +0000 |
| commit | f9d05ab007d4764a78e820aecfcf8de179d178a7 (patch) | |
| tree | 4b52d50bad0f775cb0f752343f51638d09b6eb76 /test/Transforms | |
| parent | e8ac3f3be4b4df619368bf46aa4ed91557b5f76e (diff) | |
| download | external_llvm-f9d05ab007d4764a78e820aecfcf8de179d178a7.zip external_llvm-f9d05ab007d4764a78e820aecfcf8de179d178a7.tar.gz external_llvm-f9d05ab007d4764a78e820aecfcf8de179d178a7.tar.bz2 | |
teach the truncation optimization that an entire chain of
computation can be truncated if it is fed by a sext/zext that doesn't
have to be exactly equal to the truncation result type.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112285 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms')
| -rw-r--r-- | test/Transforms/InstCombine/trunc.ll | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/test/Transforms/InstCombine/trunc.ll b/test/Transforms/InstCombine/trunc.ll index 5cb3474..f98bfd9 100644 --- a/test/Transforms/InstCombine/trunc.ll +++ b/test/Transforms/InstCombine/trunc.ll @@ -1,4 +1,5 @@ ; RUN: opt < %s -instcombine -S | FileCheck %s +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64" ; Instcombine should be able to eliminate all of these ext casts. @@ -76,7 +77,23 @@ define i92 @test7(i64 %A) { %D = trunc i128 %C to i92 ret i92 %D ; CHECK: @test7 -; CHECK: %C = lshr i64 %A, 32 -; CHECK: %D = zext i64 %C to i92 -; CHECK: ret i92 %D -}
\ No newline at end of file +; CHECK: %B = zext i64 %A to i92 +; CHECK: %C = lshr i92 %B, 32 +; CHECK: ret i92 %C +} + +define i64 @test8(i32 %A, i32 %B) { + %tmp38 = zext i32 %A to i128 + %tmp32 = zext i32 %B to i128 + %tmp33 = shl i128 %tmp32, 32 + %ins35 = or i128 %tmp33, %tmp38 + %tmp42 = trunc i128 %ins35 to i64 + ret i64 %tmp42 +; CHECK: @test8 +; CHECK: %tmp38 = zext i32 %A to i64 +; CHECK: %tmp32 = zext i32 %B to i64 +; CHECK: %tmp33 = shl i64 %tmp32, 32 +; CHECK: %ins35 = or i64 %tmp33, %tmp38 +; CHECK: ret i64 %ins35 +} + |