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Only do switch-to-lookup table transformation when TargetTransformInfo

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is available.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167552 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hans Wennborg 2012-11-07 21:35:12 +00:00
parent e90a3bcae1
commit b0319962cf
4 changed files with 11 additions and 5 deletions
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3
lib/Transforms/Utils/SimplifyCFG.cpp
View File

@ -3538,7 +3538,8 @@ static bool SwitchToLookupTable(SwitchInst *SI,
const TargetTransformInfo *TTI) {
assert(SI->getNumCases() > 1 && "Degenerate switch?");
if (TTI && !TTI->getScalarTargetTransformInfo()->shouldBuildLookupTables())
// Only build lookup table when we have a target that supports it.
if (!TTI || !TTI->getScalarTargetTransformInfo()->shouldBuildLookupTables())
return false;
// FIXME: If the switch is too sparse for a lookup table, perhaps we could

6
test/Transforms/SimplifyCFG/X86/lit.local.cfg Normal file
View File

@ -0,0 +1,6 @@
config.suffixes = ['.ll', '.c', '.cpp']
targets = set(config.root.targets_to_build.split())
if not 'X86' in targets:
config.unsupported = True

2
test/Transforms/SimplifyCFG/switch_to_lookup_table.ll → test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll
View File

@ -1,4 +1,4 @@
; RUN: opt < %s -simplifycfg -S | FileCheck %s
; RUN: opt < %s -simplifycfg -S -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
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-S128"
target triple = "x86_64-unknown-linux-gnu"

5
test/Transforms/SimplifyCFG/switch_create.ll
View File

@ -141,9 +141,8 @@ UnifiedReturnBlock: ; preds = %shortcirc_done.4, %shortcirc_next.4
ret i1 %UnifiedRetVal
; CHECK: @test6
; CHECK: %switch.tableidx = sub i32 %tmp.2.i, 14
; CHECK: %0 = icmp ult i32 %switch.tableidx, 6
; CHECK: select i1 %0, i1 true, i1 false
; CHECK: %tmp.2.i.off = add i32 %tmp.2.i, -14
; CHECK: %switch = icmp ult i32 %tmp.2.i.off, 6
}
define void @test7(i8 zeroext %c, i32 %x) nounwind ssp noredzone {