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| author | Chris Lattner <sabre@nondot.org> | 2010-05-21 18:17:54 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-05-21 18:17:54 +0000 |
| commit | a26a8471bdb132f963f26e4df2091ed204024f36 (patch) | |
| tree | e88cfb3999012b41a256078917946f4a03dd1dc5 /test/CodeGen/X86/fp-stack.ll | |
| parent | d596c90030fc7a4dbfdfcab32ce0eae10171018e (diff) | |
| download | llvm-a26a8471bdb132f963f26e4df2091ed204024f36.tar.gz llvm-a26a8471bdb132f963f26e4df2091ed204024f36.tar.bz2 llvm-a26a8471bdb132f963f26e4df2091ed204024f36.tar.xz | |
now that fp reg kill insertion stuff happens as a separate
pass after isel instead of being interlaced with it, we can
trust that all the code for a function has been isel'd before
it is run.
The practical impact of this is that we can scan for machine
instr phis instead of doing a fuzzy match on the LLVM BB for
phi nodes. Doing the fuzzy match required knowing when isel
would produce an fp reg stack phi which was gross. It was
also wrong in cases where select got lowered to a branch
tree because cmovs aren't available (PR6828).
Just do the scan on machine phis which is simpler, faster
and more correct. This fixes PR6828.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104333 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/fp-stack.ll')
| -rw-r--r-- | test/CodeGen/X86/fp-stack.ll | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/test/CodeGen/X86/fp-stack.ll b/test/CodeGen/X86/fp-stack.ll new file mode 100644 index 0000000000..dca644de66 --- /dev/null +++ b/test/CodeGen/X86/fp-stack.ll @@ -0,0 +1,25 @@ +; RUN: llc %s -o - -mcpu=pentium +; PR6828 +target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32" +target triple = "i386-pc-linux-gnu" + +define void @foo() nounwind { +entry: + %tmp6 = load x86_fp80* undef ; <x86_fp80> [#uses=2] + %tmp15 = load x86_fp80* undef ; <x86_fp80> [#uses=2] + %tmp24 = load x86_fp80* undef ; <x86_fp80> [#uses=1] + br i1 undef, label %return, label %bb.nph + +bb.nph: ; preds = %entry + %cmp139 = fcmp ogt x86_fp80 %tmp15, %tmp6 ; <i1> [#uses=1] + %maxdiag.0 = select i1 %cmp139, x86_fp80 %tmp15, x86_fp80 %tmp6 ; <x86_fp80> [#uses=1] + %cmp139.1 = fcmp ogt x86_fp80 %tmp24, %maxdiag.0 ; <i1> [#uses=1] + br i1 %cmp139.1, label %sw.bb372, label %return + +sw.bb372: ; preds = %for.end + ret void + +return: ; preds = %for.end + ret void +} + |