[llvm] eb009ed - [GlobalISel] Fix the select->minmax combine from trying to operate on pointer types.
Amara Emerson via llvm-commits
llvm-commits at lists.llvm.org
Mon Jan 15 18:20:24 PST 2024
Author: Amara Emerson
Date: 2024-01-15T18:20:18-08:00
New Revision: eb009ed2495d495e0c9bb10c29c484d563bb5cdf
URL: https://github.com/llvm/llvm-project/commit/eb009ed2495d495e0c9bb10c29c484d563bb5cdf
DIFF: https://github.com/llvm/llvm-project/commit/eb009ed2495d495e0c9bb10c29c484d563bb5cdf.diff
LOG: [GlobalISel] Fix the select->minmax combine from trying to operate on pointer types.
Added:
Modified:
llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
llvm/test/CodeGen/AArch64/GlobalISel/combine-select.mir
Removed:
################################################################################
diff --git a/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
index ca5496476e86d8..3142127076af21 100644
--- a/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
@@ -6555,6 +6555,9 @@ bool CombinerHelper::tryFoldSelectToIntMinMax(GSelect *Select,
Register False = Select->getFalseReg();
LLT DstTy = MRI.getType(DstReg);
+ if (DstTy.isPointer())
+ return false;
+
// We need an G_ICMP on the condition register.
GICmp *Cmp = getOpcodeDef<GICmp>(Cond, MRI);
if (!Cmp)
diff --git a/llvm/test/CodeGen/AArch64/GlobalISel/combine-select.mir b/llvm/test/CodeGen/AArch64/GlobalISel/combine-select.mir
index 260cb72b0426a8..da35d60981ad38 100644
--- a/llvm/test/CodeGen/AArch64/GlobalISel/combine-select.mir
+++ b/llvm/test/CodeGen/AArch64/GlobalISel/combine-select.mir
@@ -825,3 +825,30 @@ body: |
%sel:_(<4 x s32>) = exact G_SELECT %c, %t, %f
$q0 = COPY %sel(<4 x s32>)
...
+---
+name: dont_combine_pointer_type
+body: |
+ bb.1:
+ liveins: $x0
+
+ ; CHECK-LABEL: name: dont_combine_pointer_type
+ ; CHECK: liveins: $x0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
+ ; CHECK-NEXT: [[C:%[0-9]+]]:_(p0) = G_CONSTANT i64 0
+ ; CHECK-NEXT: [[LOAD:%[0-9]+]]:_(p0) = G_LOAD [[C]](p0) :: (load (p0))
+ ; CHECK-NEXT: [[ICMP:%[0-9]+]]:_(s1) = G_ICMP intpred(ugt), [[LOAD]](p0), [[C]]
+ ; CHECK-NEXT: [[SELECT:%[0-9]+]]:_(p0) = G_SELECT [[ICMP]](s1), [[LOAD]], [[C]]
+ ; CHECK-NEXT: G_STORE [[SELECT]](p0), [[COPY]](p0) :: (store (p0))
+ ; CHECK-NEXT: $x0 = COPY [[C]](p0)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %0:_(p0) = COPY $x0
+ %2:_(p0) = G_CONSTANT i64 0
+ %1:_(p0) = G_LOAD %2(p0) :: (load (p0))
+ %3:_(s1) = G_ICMP intpred(ugt), %1(p0), %2
+ %4:_(p0) = G_SELECT %3(s1), %1, %2
+ G_STORE %4(p0), %0(p0) :: (store (p0))
+ $x0 = COPY %2(p0)
+ RET_ReallyLR implicit $x0
+
+...
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