[PATCH] D98872: [amdgpu] Update med3 combine to skip i64
Jon Chesterfield via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Mar 18 08:57:04 PDT 2021
This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG253f804debb3: [amdgpu] Update med3 combine to skip i64 (authored by JonChesterfield).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D98872/new/
https://reviews.llvm.org/D98872
Files:
llvm/lib/Target/AMDGPU/SIISelLowering.cpp
llvm/test/CodeGen/AMDGPU/smed3.ll
Index: llvm/test/CodeGen/AMDGPU/smed3.ll
===================================================================
--- llvm/test/CodeGen/AMDGPU/smed3.ll
+++ llvm/test/CodeGen/AMDGPU/smed3.ll
@@ -80,6 +80,19 @@
ret void
}
+; Regression test for performIntMed3ImmCombine extending arguments to 32 bit
+; which failed for 64 bit arguments. Previously asserted / crashed.
+; GCN-LABEL: {{^}}test_intMed3ImmCombine_no_32bit_extend:
+; GCN: v_cmp_lt_i64
+; GCN: v_cmp_gt_i64
+define i64 @test_intMed3ImmCombine_no_32bit_extend(i64 %x) {
+ %smax = call i64 @llvm.smax.i64(i64 %x, i64 -2)
+ %smin = call i64 @llvm.smin.i64(i64 %smax, i64 2)
+ ret i64 %smin
+}
+declare i64 @llvm.smax.i64(i64, i64)
+declare i64 @llvm.smin.i64(i64, i64)
+
; GCN-LABEL: {{^}}v_test_smed3_r_i_i_i16:
; SICIVI: v_med3_i32 v{{[0-9]+}}, v{{[0-9]+}}, 12, 17
; GFX9: v_med3_i16 v{{[0-9]+}}, v{{[0-9]+}}, 12, 17
Index: llvm/lib/Target/AMDGPU/SIISelLowering.cpp
===================================================================
--- llvm/lib/Target/AMDGPU/SIISelLowering.cpp
+++ llvm/lib/Target/AMDGPU/SIISelLowering.cpp
@@ -9772,15 +9772,19 @@
}
// If there isn't a 16-bit med3 operation, convert to 32-bit.
- MVT NVT = MVT::i32;
- unsigned ExtOp = Signed ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
+ if (VT == MVT::i16) {
+ MVT NVT = MVT::i32;
+ unsigned ExtOp = Signed ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
- SDValue Tmp1 = DAG.getNode(ExtOp, SL, NVT, Op0->getOperand(0));
- SDValue Tmp2 = DAG.getNode(ExtOp, SL, NVT, Op0->getOperand(1));
- SDValue Tmp3 = DAG.getNode(ExtOp, SL, NVT, Op1);
+ SDValue Tmp1 = DAG.getNode(ExtOp, SL, NVT, Op0->getOperand(0));
+ SDValue Tmp2 = DAG.getNode(ExtOp, SL, NVT, Op0->getOperand(1));
+ SDValue Tmp3 = DAG.getNode(ExtOp, SL, NVT, Op1);
- SDValue Med3 = DAG.getNode(Med3Opc, SL, NVT, Tmp1, Tmp2, Tmp3);
- return DAG.getNode(ISD::TRUNCATE, SL, VT, Med3);
+ SDValue Med3 = DAG.getNode(Med3Opc, SL, NVT, Tmp1, Tmp2, Tmp3);
+ return DAG.getNode(ISD::TRUNCATE, SL, VT, Med3);
+ }
+
+ return SDValue();
}
static ConstantFPSDNode *getSplatConstantFP(SDValue Op) {
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