diff options
| author | Dan Gohman <gohman@apple.com> | 2010-04-23 01:55:05 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-04-23 01:55:05 +0000 |
| commit | fafb890ee204d60456d0780ff55a149fa082eaea (patch) | |
| tree | 3be1fcd844734fe3036a9393c946ceb1c76f4bce /test/CodeGen/X86/lsr-delayed-fold.ll | |
| parent | c6863989fc268ee0ff1469e4856e2e9404e67336 (diff) | |
| download | llvm-fafb890ee204d60456d0780ff55a149fa082eaea.tar.gz llvm-fafb890ee204d60456d0780ff55a149fa082eaea.tar.bz2 llvm-fafb890ee204d60456d0780ff55a149fa082eaea.tar.xz | |
Fix LSR to tolerate cases where ScalarEvolution initially
misses an opportunity to fold add operands, but folds them
after LSR has separated them out. This fixes rdar://7886751.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102157 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/lsr-delayed-fold.ll')
| -rw-r--r-- | test/CodeGen/X86/lsr-delayed-fold.ll | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/test/CodeGen/X86/lsr-delayed-fold.ll b/test/CodeGen/X86/lsr-delayed-fold.ll new file mode 100644 index 0000000000..f160c2d92b --- /dev/null +++ b/test/CodeGen/X86/lsr-delayed-fold.ll @@ -0,0 +1,28 @@ +; RUN: llc -march=x86-64 < %s > /dev/null +; rdar://7886751 + +; ScalarEvolution misses an opportunity to fold ((trunc x) + (trunc -x) + y), +; but LSR should tolerate this. + +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" +target triple = "x86_64-apple-darwin11.0" + +define fastcc void @formatValue(i64 %arg5) nounwind { +bb12: ; preds = %bb11 + %t = trunc i64 %arg5 to i32 ; <i32> [#uses=1] + %t13 = sub i64 0, %arg5 ; <i64> [#uses=1] + %t14 = and i64 %t13, 4294967295 ; <i64> [#uses=1] + br label %bb15 + +bb15: ; preds = %bb21, %bb12 + %t16 = phi i64 [ 0, %bb12 ], [ %t23, %bb15 ] ; <i64> [#uses=2] + %t17 = mul i64 %t14, %t16 ; <i64> [#uses=1] + %t18 = add i64 undef, %t17 ; <i64> [#uses=1] + %t19 = trunc i64 %t18 to i32 ; <i32> [#uses=1] + %t22 = icmp eq i32 %t19, %t ; <i1> [#uses=1] + %t23 = add i64 %t16, 1 ; <i64> [#uses=1] + br i1 %t22, label %bb24, label %bb15 + +bb24: ; preds = %bb21, %bb11 + unreachable +} |