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author | Tom Stellard <thomas.stellard@amd.com> | 2014-04-29 23:12:48 +0000 |
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committer | Tom Stellard <thomas.stellard@amd.com> | 2014-04-29 23:12:48 +0000 |
commit | 2a90e446c0e4110ba741166254c88e346799bc81 (patch) | |
tree | 6fb2e2896a3605c9a13a9f668f1aa233ad6347e8 /test/CodeGen | |
parent | 19a970b2dafdfaca4263557db69a70e072e0a130 (diff) | |
download | llvm-2a90e446c0e4110ba741166254c88e346799bc81.tar.gz llvm-2a90e446c0e4110ba741166254c88e346799bc81.tar.bz2 llvm-2a90e446c0e4110ba741166254c88e346799bc81.tar.xz |
R600/SI: Only select SALU instructions in the entry or exit block
SALU instructions ignore control flow, so it is not always safe to use
them within branches. This is a partial solution to this problem
until we can come up with something better.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207590 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen')
-rw-r--r-- | test/CodeGen/R600/sgpr-control-flow.ll | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/test/CodeGen/R600/sgpr-control-flow.ll b/test/CodeGen/R600/sgpr-control-flow.ll new file mode 100644 index 0000000000..06ad24d959 --- /dev/null +++ b/test/CodeGen/R600/sgpr-control-flow.ll @@ -0,0 +1,27 @@ +; RUN: llc -march=r600 -mcpu=SI -verify-machineinstrs< %s | FileCheck -check-prefix=SI %s +; +; +; Most SALU instructions ignore control flow, so we need to make sure +; they don't overwrite values from other blocks. + +; SI-NOT: S_ADD + +define void @sgpr_if_else(i32 addrspace(1)* %out, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) { +entry: + %0 = icmp eq i32 %a, 0 + br i1 %0, label %if, label %else + +if: + %1 = add i32 %b, %c + br label %endif + +else: + %2 = add i32 %d, %e + br label %endif + +endif: + %3 = phi i32 [%1, %if], [%2, %else] + %4 = add i32 %3, %a + store i32 %4, i32 addrspace(1)* %out + ret void +} |