overflow-mul.ll
6.16 KB
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; RUN: opt -S -instcombine < %s | FileCheck %s
; return mul(zext x, zext y) > MAX
define i32 @pr4917_1(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4917_1(
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
; CHECK-NOT: zext i32
%mul64 = mul i64 %l, %r
; CHECK: [[MUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %x, i32 %y)
%overflow = icmp ugt i64 %mul64, 4294967295
; CHECK: extractvalue { i32, i1 } [[MUL]], 1
%retval = zext i1 %overflow to i32
ret i32 %retval
}
; return mul(zext x, zext y) >= MAX+1
define i32 @pr4917_1a(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4917_1a(
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
; CHECK-NOT: zext i32
%mul64 = mul i64 %l, %r
; CHECK: [[MUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %x, i32 %y)
%overflow = icmp uge i64 %mul64, 4294967296
; CHECK: extractvalue { i32, i1 } [[MUL]], 1
%retval = zext i1 %overflow to i32
ret i32 %retval
}
; mul(zext x, zext y) > MAX
; mul(x, y) is used
define i32 @pr4917_2(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4917_2(
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
; CHECK-NOT: zext i32
%mul64 = mul i64 %l, %r
; CHECK: [[MUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %x, i32 %y)
%overflow = icmp ugt i64 %mul64, 4294967295
; CHECK-DAG: [[VAL:%.*]] = extractvalue { i32, i1 } [[MUL]], 0
%mul32 = trunc i64 %mul64 to i32
; CHECK-DAG: [[OVFL:%.*]] = extractvalue { i32, i1 } [[MUL]], 1
%retval = select i1 %overflow, i32 %mul32, i32 111
; CHECK: select i1 [[OVFL]], i32 [[VAL]]
ret i32 %retval
}
; return mul(zext x, zext y) > MAX
; mul is used in non-truncate
define i64 @pr4917_3(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4917_3(
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
; CHECK-NOT: umul.with.overflow.i32
%overflow = icmp ugt i64 %mul64, 4294967295
%retval = select i1 %overflow, i64 %mul64, i64 111
ret i64 %retval
}
; return mul(zext x, zext y) <= MAX
define i32 @pr4917_4(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4917_4(
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
; CHECK-NOT: zext i32
%mul64 = mul i64 %l, %r
; CHECK: [[MUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %x, i32 %y)
%overflow = icmp ule i64 %mul64, 4294967295
; CHECK: extractvalue { i32, i1 } [[MUL]], 1
; CHECK: xor
%retval = zext i1 %overflow to i32
ret i32 %retval
}
; return mul(zext x, zext y) < MAX+1
define i32 @pr4917_4a(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4917_4a(
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
; CHECK-NOT: zext i32
%mul64 = mul i64 %l, %r
; CHECK: [[MUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %x, i32 %y)
%overflow = icmp ult i64 %mul64, 4294967296
; CHECK: extractvalue { i32, i1 } [[MUL]], 1
; CHECK: xor
%retval = zext i1 %overflow to i32
ret i32 %retval
}
; operands of mul are of different size
define i32 @pr4917_5(i32 %x, i8 %y) nounwind {
; CHECK-LABEL: @pr4917_5(
entry:
%l = zext i32 %x to i64
%r = zext i8 %y to i64
; CHECK: [[Y:%.*]] = zext i8 %y to i32
%mul64 = mul i64 %l, %r
%overflow = icmp ugt i64 %mul64, 4294967295
%mul32 = trunc i64 %mul64 to i32
; CHECK: [[MUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %x, i32 [[Y]])
; CHECK-DAG: [[VAL:%.*]] = extractvalue { i32, i1 } [[MUL]], 0
; CHECK-DAG: [[OVFL:%.*]] = extractvalue { i32, i1 } [[MUL]], 1
%retval = select i1 %overflow, i32 %mul32, i32 111
; CHECK: select i1 [[OVFL]], i32 [[VAL]]
ret i32 %retval
}
; mul(zext x, zext y) != zext trunc mul
define i32 @pr4918_1(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4918_1(
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
; CHECK: [[MUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %x, i32 %y)
%part32 = trunc i64 %mul64 to i32
%part64 = zext i32 %part32 to i64
%overflow = icmp ne i64 %mul64, %part64
; CHECK: [[OVFL:%.*]] = extractvalue { i32, i1 } [[MUL:%.*]], 1
%retval = zext i1 %overflow to i32
ret i32 %retval
}
; mul(zext x, zext y) == zext trunc mul
define i32 @pr4918_2(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4918_2(
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
; CHECK: [[MUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %x, i32 %y)
%part32 = trunc i64 %mul64 to i32
%part64 = zext i32 %part32 to i64
%overflow = icmp eq i64 %mul64, %part64
; CHECK: extractvalue { i32, i1 } [[MUL]]
%retval = zext i1 %overflow to i32
; CHECK: xor
ret i32 %retval
}
; zext trunc mul != mul(zext x, zext y)
define i32 @pr4918_3(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4918_3(
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
; CHECK: [[MUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %x, i32 %y)
%part32 = trunc i64 %mul64 to i32
%part64 = zext i32 %part32 to i64
%overflow = icmp ne i64 %part64, %mul64
; CHECK: extractvalue { i32, i1 } [[MUL]], 1
%retval = zext i1 %overflow to i32
ret i32 %retval
}
define <4 x i32> @pr20113(<4 x i16> %a, <4 x i16> %b) {
; CHECK-LABEL: @pr20113
; CHECK-NOT: mul.with.overflow
; CHECK: ret
%vmovl.i.i726 = zext <4 x i16> %a to <4 x i32>
%vmovl.i.i712 = zext <4 x i16> %b to <4 x i32>
%mul.i703 = mul <4 x i32> %vmovl.i.i712, %vmovl.i.i726
%tmp = icmp sge <4 x i32> %mul.i703, zeroinitializer
%vcgez.i = sext <4 x i1> %tmp to <4 x i32>
ret <4 x i32> %vcgez.i
}
; The last test needs this weird datalayout.
target datalayout = "i32:8:8"
; Without it, InstCombine will align the pointed on 4 Bytes
; The KnownBitsZero that result from the alignment allows to
; turn:
; and i32 %mul, 255
; to:
; and i32 %mul, 252
; The mask is no longer in the form 2^n-1 and this prevents the transformation.
@pr21445_data = external global i32
define i1 @pr21445(i8 %a) {
; CHECK-LABEL: @pr21445(
; CHECK-NEXT: %[[umul:.*]] = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 %a, i8 ptrtoint (i32* @pr21445_data to i8))
; CHECK-NEXT: %[[cmp:.*]] = extractvalue { i8, i1 } %[[umul]], 1
; CHECK-NEXT: ret i1 %[[cmp]]
%ext = zext i8 %a to i32
%mul = mul i32 %ext, zext (i8 ptrtoint (i32* @pr21445_data to i8) to i32)
%and = and i32 %mul, 255
%cmp = icmp ne i32 %mul, %and
ret i1 %cmp
}