diff options
Diffstat (limited to 'llvm/test/CodeGen/AVR/smul-with-overflow.ll')
| -rw-r--r-- | llvm/test/CodeGen/AVR/smul-with-overflow.ll | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/AVR/smul-with-overflow.ll b/llvm/test/CodeGen/AVR/smul-with-overflow.ll new file mode 100644 index 00000000000..745e93005cc --- /dev/null +++ b/llvm/test/CodeGen/AVR/smul-with-overflow.ll @@ -0,0 +1,31 @@ +; RUN: llc < %s -march=avr | FileCheck %s + +define i1 @signed_multiplication_did_overflow(i8, i8) unnamed_addr { +; CHECK-LABEL: signed_multiplication_did_overflow: +entry-block: + %2 = tail call { i8, i1 } @llvm.smul.with.overflow.i8(i8 %0, i8 %1) + %3 = extractvalue { i8, i1 } %2, 1 + ret i1 %3 + +; Multiply, fill the low byte with the sign of the low byte via +; arithmetic shifting, compare it to the high byte. +; +; CHECK: muls r24, r22 +; CHECK: mov [[HIGH:r[0-9]+]], r1 +; CHECK: mov [[LOW:r[0-9]+]], r0 +; CHECK: asr {{.*}}[[LOW]] +; CHECK: asr {{.*}}[[LOW]] +; CHECK: asr {{.*}}[[LOW]] +; CHECK: asr {{.*}}[[LOW]] +; CHECK: asr {{.*}}[[LOW]] +; CHECK: asr {{.*}}[[LOW]] +; CHECK: asr {{.*}}[[LOW]] +; CHECK: ldi [[RET:r[0-9]+]], 1 +; CHECK: cp {{.*}}[[HIGH]], {{.*}}[[LOW]] +; CHECK: brne [[LABEL:LBB[_0-9]+]] +; CHECK: ldi {{.*}}[[RET]], 0 +; CHECK: {{.*}}[[LABEL]] +; CHECK: ret +} + +declare { i8, i1 } @llvm.smul.with.overflow.i8(i8, i8) |
