[PATCH] D112750: [SparcISelLowering] avoid emitting libcalls to __muloti4()
Nick Desaulniers via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Oct 28 13:00:42 PDT 2021
nickdesaulniers created this revision.
Herald added subscribers: jrtc27, fedor.sergeev, hiraditya, jyknight.
nickdesaulniers requested review of this revision.
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This compiler-rt-only symbol isn't available in libgcc.
Similar to D108842 <https://reviews.llvm.org/D108842>, D108844 <https://reviews.llvm.org/D108844>, and D108926 <https://reviews.llvm.org/D108926>.
Fixes: pr/52043
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D112750
Files:
llvm/lib/Target/Sparc/SparcISelLowering.cpp
llvm/test/CodeGen/SPARC/overflow-intrinsic-optimizations.ll
Index: llvm/test/CodeGen/SPARC/overflow-intrinsic-optimizations.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/SPARC/overflow-intrinsic-optimizations.ll
@@ -0,0 +1,15 @@
+; RUN: llc %s -mtriple=sparc -o - | FileCheck %s
+; RUN: llc %s -mtriple=sparc64 -o - | FileCheck %s
+declare { i128, i1 } @llvm.smul.with.overflow.i128(i128, i128)
+
+define i32 @mul(i128 %a, i128 %b, i128* %r) {
+; CHECK-LABEL: mul
+; CHECK-NOT: call __muloti4
+ %mul4 = tail call { i128, i1 } @llvm.smul.with.overflow.i128(i128 %a, i128 %b)
+ %mul.val = extractvalue { i128, i1 } %mul4, 0
+ %mul.ov = extractvalue { i128, i1 } %mul4, 1
+ %mul.not.ov = xor i1 %mul.ov, true
+ store i128 %mul.val, i128* %r, align 16
+ %conv = zext i1 %mul.not.ov to i32
+ ret i32 %conv
+}
Index: llvm/lib/Target/Sparc/SparcISelLowering.cpp
===================================================================
--- llvm/lib/Target/Sparc/SparcISelLowering.cpp
+++ llvm/lib/Target/Sparc/SparcISelLowering.cpp
@@ -1619,6 +1619,8 @@
setLibcallName(RTLIB::SRA_I128, nullptr);
}
+ setLibcallName(RTLIB::MULO_I128, nullptr);
+
if (!Subtarget->isV9()) {
// SparcV8 does not have FNEGD and FABSD.
setOperationAction(ISD::FNEG, MVT::f64, Custom);
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