[PATCH] Insert tbb/tbh optimization where previous jump table resided
Daniel Stewart
stewartd at codeaurora.org
Fri Dec 12 12:56:23 PST 2014
Updated the test case to use llvm.arm.space
REPOSITORY
rL LLVM
http://reviews.llvm.org/D6621
Files:
lib/Target/ARM/ARMConstantIslandPass.cpp
test/CodeGen/Thumb2/constant-islands-jump-table.ll
Index: lib/Target/ARM/ARMConstantIslandPass.cpp
===================================================================
--- lib/Target/ARM/ARMConstantIslandPass.cpp
+++ lib/Target/ARM/ARMConstantIslandPass.cpp
@@ -1952,7 +1952,9 @@
DEBUG(dbgs() << "Shrink JT: " << *MI << " addr: " << *AddrMI
<< " lea: " << *LeaMI);
unsigned Opc = ByteOk ? ARM::t2TBB_JT : ARM::t2TBH_JT;
- MachineInstr *NewJTMI = BuildMI(MBB, MI->getDebugLoc(), TII->get(Opc))
+ MachineBasicBlock::iterator MI_JT = MI;
+ MachineInstr *NewJTMI =
+ BuildMI(*MBB, MI_JT, MI->getDebugLoc(), TII->get(Opc))
.addReg(IdxReg, getKillRegState(IdxRegKill))
.addJumpTableIndex(JTI, JTOP.getTargetFlags())
.addImm(MI->getOperand(JTOpIdx+1).getImm());
Index: test/CodeGen/Thumb2/constant-islands-jump-table.ll
===================================================================
--- /dev/null
+++ test/CodeGen/Thumb2/constant-islands-jump-table.ll
@@ -0,0 +1,47 @@
+; RUN: llc < %s -mtriple=thumbv7-linux-gnueabihf -O1 %s -o - | FileCheck %s
+
+; CHECK: b .LBB
+; CHECK-NOT: tbh
+
+define i32 @test_jump_table(i32 %x, float %in) {
+
+h1:
+
+ %b0 = fadd float %in, 1234.5
+ %b1 = fptoui float %b0 to i32
+
+ switch i32 %x, label %h2 [
+ i32 0, label %h3
+ i32 2, label %h4
+ i32 4, label %h5
+ i32 6, label %h6
+ ]
+
+h2:
+ %a0 = add i32 %x, 5
+ br label %h3
+
+h3:
+ %d2 = phi i32 [%b1, %h1], [%a0, %h2]
+ %d3 = add i32 %d2, 3
+ br label %h4
+
+h4:
+ %c2 = phi i32 [%b1, %h1], [%d3, %h3]
+ %c3 = add i32 %c2, 5
+ br label %h5
+
+h5:
+ %a2 = phi i32 [%b1, %h1], [%c3, %h4]
+ %a3 = add i32 %a2, 6
+ br label %h6
+
+h6:
+ %y = phi i32 [0, %h1], [%a3, %h5]
+ call i32 @llvm.arm.space(i32 2000, i32 undef)
+ ret i32 %y
+
+}
+
+declare i32 @llvm.arm.space(i32, i32)
+
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