[PATCH] D108842: [ARMISelLowering] avoid emitting libcalls to __mulodi4()

[Nick Desaulniers via Phabricator via llvm-commits]

nickdesaulniers updated this revision to Diff 369193.
nickdesaulniers marked 2 inline comments as done.
nickdesaulniers added a comment.

- mem2reg (PEBKAC)


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D108842/new/

https://reviews.llvm.org/D108842

Files:
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/test/CodeGen/ARM/overflow-intrinsic-optimizations.ll


Index: llvm/test/CodeGen/ARM/overflow-intrinsic-optimizations.ll
===================================================================
--- llvm/test/CodeGen/ARM/overflow-intrinsic-optimizations.ll
+++ llvm/test/CodeGen/ARM/overflow-intrinsic-optimizations.ll
@@ -234,6 +234,22 @@
   ret i32 %conv
 }
 
+define void @no__mulodi4(i32 %a, i64 %b, i32* %c) {
+; CHECK-LABEL: no__mulodi4
+; CHECK-NOT: bl __mulodi4
+entry:
+  %0 = sext i32 %a to i64
+  %1 = call { i64, i1 } @llvm.smul.with.overflow.i64(i64 %0, i64 %b)
+  %2 = extractvalue { i64, i1 } %1, 1
+  %3 = extractvalue { i64, i1 } %1, 0
+  %4 = trunc i64 %3 to i32
+  %5 = sext i32 %4 to i64
+  %6 = icmp ne i64 %3, %5
+  %7 = or i1 %2, %6
+  store i32 %4, i32* %c, align 4
+  ret void
+}
+
 declare void @llvm.trap() #2
 declare { i32, i1 } @llvm.sadd.with.overflow.i32(i32, i32) #1
 declare { i32, i1 } @llvm.uadd.with.overflow.i32(i32, i32) #1
@@ -241,3 +257,4 @@
 declare { i32, i1 } @llvm.usub.with.overflow.i32(i32, i32) #1
 declare { i32, i1 } @llvm.smul.with.overflow.i32(i32, i32) #1
 declare { i32, i1 } @llvm.umul.with.overflow.i32(i32, i32) #1
+declare { i64, i1 } @llvm.smul.with.overflow.i64(i64, i64)
Index: llvm/lib/Target/ARM/ARMISelLowering.cpp
===================================================================
--- llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -545,6 +545,8 @@
   setLibcallName(RTLIB::SRL_I128, nullptr);
   setLibcallName(RTLIB::SRA_I128, nullptr);
   setLibcallName(RTLIB::MUL_I128, nullptr);
+  setLibcallName(RTLIB::MULO_I64, nullptr);
+  setLibcallName(RTLIB::MULO_I128, nullptr);
 
   // RTLIB
   if (Subtarget->isAAPCS_ABI() &&


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