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| author | Jun Bum Lim <junbuml@codeaurora.org> | 2017-01-27 17:16:37 +0000 |
|---|---|---|
| committer | Jun Bum Lim <junbuml@codeaurora.org> | 2017-01-27 17:16:37 +0000 |
| commit | b99a06b7c9f4f6559da9fefeb1011c8aefe3f34c (patch) | |
| tree | f4d23b358c90ca976ab61e58859fbcc0b1e1d1c6 /llvm/test | |
| parent | 091f1b6ef314d4e0e37eaf438c63c307253e8b42 (diff) | |
| download | bcm5719-llvm-b99a06b7c9f4f6559da9fefeb1011c8aefe3f34c.tar.gz bcm5719-llvm-b99a06b7c9f4f6559da9fefeb1011c8aefe3f34c.zip | |
[CodeGenPrep]No negative cost in the ExtLd promotion
Summary: This change prevent the signed value of cost from being negative as the value is passed as an unsigned argument.
Reviewers: mcrosier, jmolloy, qcolombet, javed.absar
Reviewed By: mcrosier, qcolombet
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D28871
llvm-svn: 293307
Diffstat (limited to 'llvm/test')
| -rw-r--r-- | llvm/test/CodeGen/AArch64/arm64-codegen-prepare-extload.ll | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/AArch64/arm64-codegen-prepare-extload.ll b/llvm/test/CodeGen/AArch64/arm64-codegen-prepare-extload.ll index c9f668f2c42..3d9c86139ed 100644 --- a/llvm/test/CodeGen/AArch64/arm64-codegen-prepare-extload.ll +++ b/llvm/test/CodeGen/AArch64/arm64-codegen-prepare-extload.ll @@ -636,3 +636,24 @@ define i64 @doNotPromoteBecauseOfPairedLoad(i32* %p, i32 %cst) { %final = add i64 %sextres, %zextLd0 ret i64 %final } + +define i64 @promoteZextShl(i1 %c, i16* %P) { +entry: +; OPTALL-LABEL: promoteZextShl +; OPTALL-LABEL: entry: +; OPT: %[[LD:.*]] = load i16, i16* %P +; OPT: %[[EXT:.*]] = zext i16 %[[LD]] to i64 +; OPT-LABEL: if.then: +; OPT: shl nsw i64 %[[EXT]], 1 +; DISABLE-LABEL: if.then: +; DISABLE: %r = sext i32 %shl2 to i64 + %ld = load i16, i16* %P + br i1 %c, label %end, label %if.then +if.then: + %z = zext i16 %ld to i32 + %shl2 = shl nsw i32 %z, 1 + %r = sext i32 %shl2 to i64 + ret i64 %r +end: + ret i64 0 +} |
