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| author | Hans Wennborg <hans@hanshq.net> | 2015-05-08 21:23:39 +0000 |
|---|---|---|
| committer | Hans Wennborg <hans@hanshq.net> | 2015-05-08 21:23:39 +0000 |
| commit | ae0254dabca242f69e2d534097df84f810c7a2d0 (patch) | |
| tree | 210f5f4db45bcd4baa5a6efb4b587e12fd26fbdb /llvm/test/CodeGen/X86/switch.ll | |
| parent | c67979bf4d301654e3863d0e3adc3f6a3d5bba29 (diff) | |
| download | bcm5719-llvm-ae0254dabca242f69e2d534097df84f810c7a2d0.tar.gz bcm5719-llvm-ae0254dabca242f69e2d534097df84f810c7a2d0.zip | |
Switch lowering: cluster adjacent fall-through cases even at -O0
It's cheap to do, and codegen is much faster if cases can be merged
into clusters.
llvm-svn: 236905
Diffstat (limited to 'llvm/test/CodeGen/X86/switch.ll')
| -rw-r--r-- | llvm/test/CodeGen/X86/switch.ll | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/llvm/test/CodeGen/X86/switch.ll b/llvm/test/CodeGen/X86/switch.ll index d50eabaa261..66a739c8470 100644 --- a/llvm/test/CodeGen/X86/switch.ll +++ b/llvm/test/CodeGen/X86/switch.ll @@ -9,18 +9,19 @@ entry: i32 3, label %bb0 i32 1, label %bb1 i32 4, label %bb1 - i32 5, label %bb0 + i32 5, label %bb2 ] bb0: tail call void @g(i32 0) br label %return bb1: tail call void @g(i32 1) br label %return +bb2: tail call void @g(i32 1) br label %return return: ret void ; Should be lowered as straight compares in -O0 mode. ; NOOPT-LABEL: basic -; NOOPT: subl $3, %eax -; NOOPT: je ; NOOPT: subl $1, %eax ; NOOPT: je +; NOOPT: subl $3, %eax +; NOOPT: je ; NOOPT: subl $4, %eax ; NOOPT: je ; NOOPT: subl $5, %eax @@ -58,6 +59,14 @@ return: ret void ; CHECK: jae ; CHECK: cmpl $3 ; CHECK: ja + +; We do this even at -O0, because it's cheap and makes codegen faster. +; NOOPT-LABEL: simple_ranges +; NOOPT: subl $4 +; NOOPT: jb +; NOOPT: addl $-100 +; NOOPT: subl $4 +; NOOPT: jb } |
