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[Hexagon] Guard the generation of lookup table

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The llvm flag "-hexagon-emit-lookup-tables" guards the generation
of lookup table from a switch statement.

Differential Revision: https://reviews.llvm.org/D34819

llvm-svn: 306869
This commit is contained in:
Sumanth Gundapaneni 2017-06-30 20:10:28 +00:00
parent da74570a09
commit 1a79606bfe
3 changed files with 69 additions and 0 deletions
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9
lib/Target/Hexagon/HexagonTargetObjectFile.cpp
View File

@ -49,6 +49,10 @@ static cl::opt<bool> TraceGVPlacement("trace-gv-placement",
cl::Hidden, cl::init(false),
cl::desc("Trace global value placement"));
static cl::opt<bool>
EmitJtInText("hexagon-emit-jt-text", cl::Hidden, cl::init(false),
cl::desc("Emit hexagon jump tables in function section"));
// TraceGVPlacement controls messages for all builds. For builds with assertions
// (debug or release), messages are also controlled by the usual debug flags
// (e.g. -debug and -debug-only=globallayout)
@ -256,6 +260,11 @@ unsigned HexagonTargetObjectFile::getSmallDataSize() const {
return SmallDataThreshold;
}
bool HexagonTargetObjectFile::shouldPutJumpTableInFunctionSection(
bool UsesLabelDifference, const Function &F) const {
return EmitJtInText;
}
/// Descends any type down to "elementary" components,
/// discovering the smallest addressable one.
/// If zero is returned, declaration will not be modified.

3
lib/Target/Hexagon/HexagonTargetObjectFile.h
View File

@ -33,6 +33,9 @@ namespace llvm {
unsigned getSmallDataSize() const;
bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference,
const Function &F) const override;
private:
MCSectionELF *SmallDataSection;
MCSectionELF *SmallBSSSection;

57
test/CodeGen/Hexagon/jt-in-text.ll Normal file
View File

@ -0,0 +1,57 @@
; RUN: llc -hexagon-emit-jt-text=true < %s | FileCheck %s
target datalayout = "e-m:e-p:32:32:32-a:0-n16:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048"
target triple = "hexagon-unknown--elf"
; CHECK: .text
; CHECK-NOT: .rodata
; CHECK: .word
@lane0_pwr_st = global i32 0, align 4
@lane1_pwr_st = global i32 0, align 4
@lane2_pwr_st = global i32 0, align 4
@lane3_pwr_st = global i32 0, align 4
; Function Attrs: noinline nounwind
define void @test2(i32 %lane_id, i32 %rx_pwr_st) #0 {
entry:
%lane_id.addr = alloca i32, align 4
%rx_pwr_st.addr = alloca i32, align 4
store i32 %lane_id, i32* %lane_id.addr, align 4
store i32 %rx_pwr_st, i32* %rx_pwr_st.addr, align 4
%0 = load i32, i32* %lane_id.addr, align 4
switch i32 %0, label %sw.epilog [
i32 0, label %sw.bb
i32 1, label %sw.bb1
i32 2, label %sw.bb2
i32 3, label %sw.bb3
i32 15, label %sw.bb4
]
sw.bb: ; preds = %entry
store i32 1, i32* @lane0_pwr_st, align 4
br label %sw.epilog
sw.bb1: ; preds = %entry
store i32 1, i32* @lane1_pwr_st, align 4
br label %sw.epilog
sw.bb2: ; preds = %entry
store i32 1, i32* @lane2_pwr_st, align 4
br label %sw.epilog
sw.bb3: ; preds = %entry
store i32 1, i32* @lane3_pwr_st, align 4
br label %sw.epilog
sw.bb4: ; preds = %entry
store i32 1, i32* @lane0_pwr_st, align 4
store i32 1, i32* @lane1_pwr_st, align 4
store i32 1, i32* @lane2_pwr_st, align 4
store i32 1, i32* @lane3_pwr_st, align 4
br label %sw.epilog
sw.epilog: ; preds = %entry, %sw.bb4, %sw.bb3, %sw.bb2, %sw.bb1, %sw.bb
ret void
}
attributes #0 = { noinline nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="hexagonv60" "target-features"="-hvx-double,-long-calls" "unsafe-fp-math"="false" "use-soft-float"="false" }