[llvm-commits] [llvm] r103984 - in /llvm/trunk: lib/CodeGen/TwoAddressInstructionPass.cpp test/CodeGen/ARM/reg_sequence.ll
Evan Cheng
evan.cheng at apple.com
Mon May 17 15:09:49 PDT 2010
Author: evancheng
Date: Mon May 17 17:09:49 2010
New Revision: 103984
URL: http://llvm.org/viewvc/llvm-project?rev=103984&view=rev
Log:
Fix PR7156. If the sources of a REG_SEQUENCE are all IMPLICIT_DEF's. Replace it with an IMPLICIT_DEF rather than deleting it or else it would be left without a def.
Modified:
llvm/trunk/lib/CodeGen/TwoAddressInstructionPass.cpp
llvm/trunk/test/CodeGen/ARM/reg_sequence.ll
Modified: llvm/trunk/lib/CodeGen/TwoAddressInstructionPass.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/TwoAddressInstructionPass.cpp?rev=103984&r1=103983&r2=103984&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/TwoAddressInstructionPass.cpp (original)
+++ llvm/trunk/lib/CodeGen/TwoAddressInstructionPass.cpp Mon May 17 17:09:49 2010
@@ -1238,6 +1238,7 @@
llvm_unreachable(0);
}
+ bool IsImpDef = true;
SmallVector<unsigned, 4> RealSrcs;
SmallSet<unsigned, 4> Seen;
for (unsigned i = 1, e = MI->getNumOperands(); i < e; i += 2) {
@@ -1253,6 +1254,7 @@
DefMI->eraseFromParent();
continue;
}
+ IsImpDef = false;
// Remember EXTRACT_SUBREG sources. These might be candidate for
// coalescing.
@@ -1297,8 +1299,15 @@
UpdateRegSequenceSrcs(SrcReg, DstReg, SubIdx, MRI);
}
- DEBUG(dbgs() << "Eliminated: " << *MI);
- MI->eraseFromParent();
+ if (IsImpDef) {
+ DEBUG(dbgs() << "Turned: " << *MI << " into an IMPLICIT_DEF");
+ MI->setDesc(TII->get(TargetOpcode::IMPLICIT_DEF));
+ for (int j = MI->getNumOperands() - 1, ee = 0; j > ee; --j)
+ MI->RemoveOperand(j);
+ } else {
+ DEBUG(dbgs() << "Eliminated: " << *MI);
+ MI->eraseFromParent();
+ }
// Try coalescing some EXTRACT_SUBREG instructions.
CoalesceExtSubRegs(RealSrcs, DstReg);
Modified: llvm/trunk/test/CodeGen/ARM/reg_sequence.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/ARM/reg_sequence.ll?rev=103984&r1=103983&r2=103984&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/ARM/reg_sequence.ll (original)
+++ llvm/trunk/test/CodeGen/ARM/reg_sequence.ll Mon May 17 17:09:49 2010
@@ -185,6 +185,50 @@
ret void
}
+; PR7156
+define arm_aapcs_vfpcc i32 @t8() nounwind {
+; CHECK: t8:
+; CHECK: vrsqrte.f32 q0, q0
+bb.nph55.bb.nph55.split_crit_edge:
+ br label %bb3
+
+bb3: ; preds = %bb3, %bb.nph55.bb.nph55.split_crit_edge
+ br i1 undef, label %bb5, label %bb3
+
+bb5: ; preds = %bb3
+ br label %bb.i25
+
+bb.i25: ; preds = %bb.i25, %bb5
+ %0 = shufflevector <2 x float> undef, <2 x float> undef, <4 x i32> <i32 0, i32 1, i32 2, i32 3> ; <<4 x float>> [#uses=1]
+ %1 = call <4 x float> @llvm.arm.neon.vrsqrte.v4f32(<4 x float> %0) nounwind ; <<4 x float>> [#uses=1]
+ %2 = fmul <4 x float> %1, undef ; <<4 x float>> [#uses=1]
+ %3 = fmul <4 x float> undef, %2 ; <<4 x float>> [#uses=1]
+ %tmp26.i = bitcast <4 x float> %3 to <2 x double> ; <<2 x double>> [#uses=1]
+ %4 = extractelement <2 x double> %tmp26.i, i32 0 ; <double> [#uses=1]
+ %5 = bitcast double %4 to <2 x float> ; <<2 x float>> [#uses=1]
+ %6 = extractelement <2 x float> %5, i32 1 ; <float> [#uses=1]
+ store float %6, float* undef, align 4
+ br i1 undef, label %bb6, label %bb.i25
+
+bb6: ; preds = %bb.i25
+ br i1 undef, label %bb7, label %bb14
+
+bb7: ; preds = %bb6
+ br label %bb.i49
+
+bb.i49: ; preds = %bb.i49, %bb7
+ br i1 undef, label %bb.i19, label %bb.i49
+
+bb.i19: ; preds = %bb.i19, %bb.i49
+ br i1 undef, label %exit, label %bb.i19
+
+exit: ; preds = %bb.i19
+ unreachable
+
+bb14: ; preds = %bb6
+ ret i32 0
+}
+
declare <4 x i32> @llvm.arm.neon.vld1.v4i32(i8*) nounwind readonly
declare <8 x i16> @llvm.arm.neon.vld1.v8i16(i8*) nounwind readonly
@@ -209,4 +253,6 @@
declare void @llvm.arm.neon.vst2.v4i32(i8*, <4 x i32>, <4 x i32>) nounwind
+declare <4 x float> @llvm.arm.neon.vrsqrte.v4f32(<4 x float>) nounwind readnone
+
declare void @llvm.trap() nounwind
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