diff options
| -rw-r--r-- | llvm/test/Transforms/InstCombine/srem-via-sdiv-mul-sub.ll | 117 | ||||
| -rw-r--r-- | llvm/test/Transforms/InstCombine/urem-via-udiv-mul-sub.ll | 117 |
2 files changed, 234 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/srem-via-sdiv-mul-sub.ll b/llvm/test/Transforms/InstCombine/srem-via-sdiv-mul-sub.ll new file mode 100644 index 00000000000..8690faa7a61 --- /dev/null +++ b/llvm/test/Transforms/InstCombine/srem-via-sdiv-mul-sub.ll @@ -0,0 +1,117 @@ +; NOTE: Assertions have been autogenerated by utils/update_test_checks.py +; RUN: opt %s -instcombine -S | FileCheck %s + +; Fold +; x - ((x / y) * y) +; to +; x % y + +; Also, +; ((x / y) * y) +; can then be simplified to +; x - (x % y) + +declare void @use8(i8) +declare void @use2xi8(<2 x i8>) + +define i8 @t0_basic(i8 %x, i8 %y) { +; CHECK-LABEL: @t0_basic( +; CHECK-NEXT: [[DIV:%.*]] = sdiv i8 [[X:%.*]], [[Y:%.*]] +; CHECK-NEXT: call void @use8(i8 [[DIV]]) +; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y]] +; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]] +; CHECK-NEXT: ret i8 [[REM]] +; + %div = sdiv i8 %x, %y + call void @use8(i8 %div) + %roundXdownToMultipleOfY = mul i8 %div, %y + %rem = sub i8 %x, %roundXdownToMultipleOfY + ret i8 %rem +} + +define <2 x i8> @t1_vector(<2 x i8> %x, <2 x i8> %y) { +; CHECK-LABEL: @t1_vector( +; CHECK-NEXT: [[DIV:%.*]] = sdiv <2 x i8> [[X:%.*]], [[Y:%.*]] +; CHECK-NEXT: call void @use2xi8(<2 x i8> [[DIV]]) +; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul <2 x i8> [[DIV]], [[Y]] +; CHECK-NEXT: [[REM:%.*]] = sub <2 x i8> [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]] +; CHECK-NEXT: ret <2 x i8> [[REM]] +; + %div = sdiv <2 x i8> %x, %y + call void @use2xi8(<2 x i8> %div) + %roundXdownToMultipleOfY = mul <2 x i8> %div, %y + %rem = sub <2 x i8> %x, %roundXdownToMultipleOfY + ret <2 x i8> %rem +} + +; Extra use + +define i8 @t4_extrause(i8 %x, i8 %y) { +; CHECK-LABEL: @t4_extrause( +; CHECK-NEXT: [[DIV:%.*]] = sdiv i8 [[X:%.*]], [[Y:%.*]] +; CHECK-NEXT: call void @use8(i8 [[DIV]]) +; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y]] +; CHECK-NEXT: call void @use8(i8 [[ROUNDXDOWNTOMULTIPLEOFY]]) +; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]] +; CHECK-NEXT: ret i8 [[REM]] +; + %div = sdiv i8 %x, %y + call void @use8(i8 %div) + %roundXdownToMultipleOfY = mul i8 %div, %y + call void @use8(i8 %roundXdownToMultipleOfY) + %rem = sub i8 %x, %roundXdownToMultipleOfY + ret i8 %rem +} + +; Commutativity + +declare i8 @gen8() + +define i8 @t5_commutative(i8 %x) { +; CHECK-LABEL: @t5_commutative( +; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8() +; CHECK-NEXT: [[DIV:%.*]] = sdiv i8 [[X:%.*]], [[Y]] +; CHECK-NEXT: call void @use8(i8 [[DIV]]) +; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[Y]], [[DIV]] +; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]] +; CHECK-NEXT: ret i8 [[REM]] +; + %y = call i8 @gen8() + %div = sdiv i8 %x, %y + call void @use8(i8 %div) + %roundXdownToMultipleOfY = mul i8 %y, %div ; swapped + %rem = sub i8 %x, %roundXdownToMultipleOfY + ret i8 %rem +} + +; Negative tests + +define i8 @n6_different_x(i8 %x0, i8 %x1, i8 %y) { +; CHECK-LABEL: @n6_different_x( +; CHECK-NEXT: [[DIV:%.*]] = sdiv i8 [[X0:%.*]], [[Y:%.*]] +; CHECK-NEXT: call void @use8(i8 [[DIV]]) +; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y]] +; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X1:%.*]], [[ROUNDXDOWNTOMULTIPLEOFY]] +; CHECK-NEXT: ret i8 [[REM]] +; + %div = sdiv i8 %x0, %y + call void @use8(i8 %div) + %roundXdownToMultipleOfY = mul i8 %div, %y + %rem = sub i8 %x1, %roundXdownToMultipleOfY + ret i8 %rem +} + +define i8 @n6_different_y(i8 %x, i8 %y0, i8 %y1) { +; CHECK-LABEL: @n6_different_y( +; CHECK-NEXT: [[DIV:%.*]] = sdiv i8 [[X:%.*]], [[Y0:%.*]] +; CHECK-NEXT: call void @use8(i8 [[DIV]]) +; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y1:%.*]] +; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]] +; CHECK-NEXT: ret i8 [[REM]] +; + %div = sdiv i8 %x, %y0 + call void @use8(i8 %div) + %roundXdownToMultipleOfY = mul i8 %div, %y1 + %rem = sub i8 %x, %roundXdownToMultipleOfY + ret i8 %rem +} diff --git a/llvm/test/Transforms/InstCombine/urem-via-udiv-mul-sub.ll b/llvm/test/Transforms/InstCombine/urem-via-udiv-mul-sub.ll new file mode 100644 index 00000000000..0e28a0d72c3 --- /dev/null +++ b/llvm/test/Transforms/InstCombine/urem-via-udiv-mul-sub.ll @@ -0,0 +1,117 @@ +; NOTE: Assertions have been autogenerated by utils/update_test_checks.py +; RUN: opt %s -instcombine -S | FileCheck %s + +; Fold +; x - ((x / y) * y) +; to +; x % y + +; Also, +; ((x / y) * y) +; can then be simplified to +; x - (x % y) + +declare void @use8(i8) +declare void @use2xi8(<2 x i8>) + +define i8 @t0_basic(i8 %x, i8 %y) { +; CHECK-LABEL: @t0_basic( +; CHECK-NEXT: [[DIV:%.*]] = udiv i8 [[X:%.*]], [[Y:%.*]] +; CHECK-NEXT: call void @use8(i8 [[DIV]]) +; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y]] +; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]] +; CHECK-NEXT: ret i8 [[REM]] +; + %div = udiv i8 %x, %y + call void @use8(i8 %div) + %roundXdownToMultipleOfY = mul i8 %div, %y + %rem = sub i8 %x, %roundXdownToMultipleOfY + ret i8 %rem +} + +define <2 x i8> @t1_vector(<2 x i8> %x, <2 x i8> %y) { +; CHECK-LABEL: @t1_vector( +; CHECK-NEXT: [[DIV:%.*]] = udiv <2 x i8> [[X:%.*]], [[Y:%.*]] +; CHECK-NEXT: call void @use2xi8(<2 x i8> [[DIV]]) +; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul <2 x i8> [[DIV]], [[Y]] +; CHECK-NEXT: [[REM:%.*]] = sub <2 x i8> [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]] +; CHECK-NEXT: ret <2 x i8> [[REM]] +; + %div = udiv <2 x i8> %x, %y + call void @use2xi8(<2 x i8> %div) + %roundXdownToMultipleOfY = mul <2 x i8> %div, %y + %rem = sub <2 x i8> %x, %roundXdownToMultipleOfY + ret <2 x i8> %rem +} + +; Extra use + +define i8 @t4_extrause(i8 %x, i8 %y) { +; CHECK-LABEL: @t4_extrause( +; CHECK-NEXT: [[DIV:%.*]] = udiv i8 [[X:%.*]], [[Y:%.*]] +; CHECK-NEXT: call void @use8(i8 [[DIV]]) +; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y]] +; CHECK-NEXT: call void @use8(i8 [[ROUNDXDOWNTOMULTIPLEOFY]]) +; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]] +; CHECK-NEXT: ret i8 [[REM]] +; + %div = udiv i8 %x, %y + call void @use8(i8 %div) + %roundXdownToMultipleOfY = mul i8 %div, %y + call void @use8(i8 %roundXdownToMultipleOfY) + %rem = sub i8 %x, %roundXdownToMultipleOfY + ret i8 %rem +} + +; Commutativity + +declare i8 @gen8() + +define i8 @t5_commutative(i8 %x) { +; CHECK-LABEL: @t5_commutative( +; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8() +; CHECK-NEXT: [[DIV:%.*]] = udiv i8 [[X:%.*]], [[Y]] +; CHECK-NEXT: call void @use8(i8 [[DIV]]) +; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[Y]], [[DIV]] +; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]] +; CHECK-NEXT: ret i8 [[REM]] +; + %y = call i8 @gen8() + %div = udiv i8 %x, %y + call void @use8(i8 %div) + %roundXdownToMultipleOfY = mul i8 %y, %div ; swapped + %rem = sub i8 %x, %roundXdownToMultipleOfY + ret i8 %rem +} + +; Negative tests + +define i8 @n6_different_x(i8 %x0, i8 %x1, i8 %y) { +; CHECK-LABEL: @n6_different_x( +; CHECK-NEXT: [[DIV:%.*]] = udiv i8 [[X0:%.*]], [[Y:%.*]] +; CHECK-NEXT: call void @use8(i8 [[DIV]]) +; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y]] +; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X1:%.*]], [[ROUNDXDOWNTOMULTIPLEOFY]] +; CHECK-NEXT: ret i8 [[REM]] +; + %div = udiv i8 %x0, %y + call void @use8(i8 %div) + %roundXdownToMultipleOfY = mul i8 %div, %y + %rem = sub i8 %x1, %roundXdownToMultipleOfY + ret i8 %rem +} + +define i8 @n6_different_y(i8 %x, i8 %y0, i8 %y1) { +; CHECK-LABEL: @n6_different_y( +; CHECK-NEXT: [[DIV:%.*]] = udiv i8 [[X:%.*]], [[Y0:%.*]] +; CHECK-NEXT: call void @use8(i8 [[DIV]]) +; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y1:%.*]] +; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]] +; CHECK-NEXT: ret i8 [[REM]] +; + %div = udiv i8 %x, %y0 + call void @use8(i8 %div) + %roundXdownToMultipleOfY = mul i8 %div, %y1 + %rem = sub i8 %x, %roundXdownToMultipleOfY + ret i8 %rem +} |
