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[InstCombine] Add test coverage for PR48683 

D108992 added self-multiply handling to KnownBits::mul but we don't use it yet..
This commit is contained in:
Simon Pilgrim 2022-01-23 18:03:12 +00:00
parent 0b79979180
commit f69379d0a4
1 changed files with 44 additions and 3 deletions
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47
llvm/test/Transforms/InstCombine/mul-masked-bits.ll
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@ -1,10 +1,10 @@
; NOTE: Assertions have been autogenerated by update_test_checks.py
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
define i32 @foo(i32 %x, i32 %y) {
; CHECK-LABEL: @foo(
; CHECK-NEXT: [[A:%.*]] = and i32 %x, 7
; CHECK-NEXT: [[B:%.*]] = and i32 %y, 7
; CHECK-NEXT: [[A:%.*]] = and i32 [[X:%.*]], 7
; CHECK-NEXT: [[B:%.*]] = and i32 [[Y:%.*]], 7
; CHECK-NEXT: [[C:%.*]] = mul nuw nsw i32 [[A]], [[B]]
; CHECK-NEXT: [[D:%.*]] = shl nuw i32 [[C]], 26
; CHECK-NEXT: [[E:%.*]] = ashr exact i32 [[D]], 26
@ -17,3 +17,44 @@ define i32 @foo(i32 %x, i32 %y) {
%e = ashr i32 %d, 26
ret i32 %e
}
; PR48683 'Quadratic Reciprocity' - and(mul(x,x),2) -> 0
define i1 @PR48683(i32 %x) {
; CHECK-LABEL: @PR48683(
; CHECK-NEXT: [[A:%.*]] = mul i32 [[X:%.*]], [[X]]
; CHECK-NEXT: [[B:%.*]] = and i32 [[A]], 2
; CHECK-NEXT: [[C:%.*]] = icmp ne i32 [[B]], 0
; CHECK-NEXT: ret i1 [[C]]
;
%a = mul i32 %x, %x
%b = and i32 %a, 2
%c = icmp ne i32 %b, 0
ret i1 %c
}
define <4 x i1> @PR48683_vec(<4 x i32> %x) {
; CHECK-LABEL: @PR48683_vec(
; CHECK-NEXT: [[A:%.*]] = mul <4 x i32> [[X:%.*]], [[X]]
; CHECK-NEXT: [[B:%.*]] = and <4 x i32> [[A]], <i32 2, i32 2, i32 2, i32 2>
; CHECK-NEXT: [[C:%.*]] = icmp ne <4 x i32> [[B]], zeroinitializer
; CHECK-NEXT: ret <4 x i1> [[C]]
;
%a = mul <4 x i32> %x, %x
%b = and <4 x i32> %a, <i32 2, i32 2, i32 2, i32 2>
%c = icmp ne <4 x i32> %b, zeroinitializer
ret <4 x i1> %c
}
define <4 x i1> @PR48683_vec_undef(<4 x i32> %x) {
; CHECK-LABEL: @PR48683_vec_undef(
; CHECK-NEXT: [[A:%.*]] = mul <4 x i32> [[X:%.*]], [[X]]
; CHECK-NEXT: [[B:%.*]] = and <4 x i32> [[A]], <i32 2, i32 2, i32 2, i32 undef>
; CHECK-NEXT: [[C:%.*]] = icmp ne <4 x i32> [[B]], zeroinitializer
; CHECK-NEXT: ret <4 x i1> [[C]]
;
%a = mul <4 x i32> %x, %x
%b = and <4 x i32> %a, <i32 2, i32 2, i32 2, i32 undef>
%c = icmp ne <4 x i32> %b, zeroinitializer
ret <4 x i1> %c
}