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| author | Ulrich Weigand <ulrich.weigand@de.ibm.com> | 2017-09-19 20:50:05 +0000 |
|---|---|---|
| committer | Ulrich Weigand <ulrich.weigand@de.ibm.com> | 2017-09-19 20:50:05 +0000 |
| commit | 5994e167a78be1204d127a7835eb2e38245b614b (patch) | |
| tree | 75c9aa142ab4b088b9b3914a510e53f8243875df /test/CodeGen/SystemZ | |
| parent | 3a6eaef3ccd5810e72dd520c98bb1c609f8a525b (diff) | |
[SystemZ] Fix truncstore + bswap codegen bug
SystemZTargetLowering::combineSTORE contains code to transform a
combination of STORE + BSWAP into a STRV type instruction.
This transformation is correct for regular stores, but not for
truncating stores. The routine neglected to check for that case.
Fixes a miscompilation of llvm-objcopy with clang, which caused
test suite failures in the SystemZ multistage build bot.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313669 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/SystemZ')
| -rw-r--r-- | test/CodeGen/SystemZ/bswap-08.ll | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/test/CodeGen/SystemZ/bswap-08.ll b/test/CodeGen/SystemZ/bswap-08.ll new file mode 100644 index 00000000000..f82b09b37b7 --- /dev/null +++ b/test/CodeGen/SystemZ/bswap-08.ll @@ -0,0 +1,17 @@ +; Verify that truncating stores do not use STRV +; +; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s + +declare i64 @llvm.bswap.i64(i64) + +define void @f1(i32* %x, i64* %y) { +; CHECK-LABEL: f1: +; CHECK-NOT: strv +; CHECK: br %r14 + %a = load i64, i64* %y, align 8 + %b = tail call i64 @llvm.bswap.i64(i64 %a) + %conv = trunc i64 %b to i32 + store i32 %conv, i32* %x, align 4 + ret void +} + |