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[InstCombine] Add some (vXi1 trunc(lshr(x,c))) -> icmp_eq(and(x,c')) tests for vectors with undef elements 

Suggested on D83035
This commit is contained in:
Simon Pilgrim 2020-07-02 15:09:52 +01:00
parent 5012ddd5af
commit 103d62e131
2 changed files with 42 additions and 0 deletions
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12
llvm/test/Transforms/InstCombine/apint-shift.ll
View File

@ -341,6 +341,18 @@ define <2 x i1> @test16vec_nonuniform(<2 x i84> %X) {
ret <2 x i1> %cmp
}
define <2 x i1> @test16vec_undef(<2 x i84> %X) {
; CHECK-LABEL: @test16vec_undef(
; CHECK-NEXT: [[SHR1:%.*]] = lshr <2 x i84> [[X:%.*]], <i84 4, i84 undef>
; CHECK-NEXT: [[CMP:%.*]] = trunc <2 x i84> [[SHR1]] to <2 x i1>
; CHECK-NEXT: ret <2 x i1> [[CMP]]
;
%shr = ashr <2 x i84> %X, <i84 4, i84 undef>
%and = and <2 x i84> %shr, <i84 1, i84 1>
%cmp = icmp ne <2 x i84> %and, zeroinitializer
ret <2 x i1> %cmp
}
define i1 @test17(i106 %A) {
; CHECK-LABEL: @test17(
; CHECK-NEXT: [[B_MASK:%.*]] = and i106 [[A:%.*]], -8

30
llvm/test/Transforms/InstCombine/icmp.ll
View File

@ -2700,6 +2700,20 @@ define <2 x i1> @icmp_and_or_lshr_cst_vec_nonuniform(<2 x i32> %x) {
ret <2 x i1> %ret
}
define <2 x i1> @icmp_and_or_lshr_cst_vec_undef(<2 x i32> %x) {
; CHECK-LABEL: @icmp_and_or_lshr_cst_vec_undef(
; CHECK-NEXT: [[SHF:%.*]] = lshr <2 x i32> [[X:%.*]], <i32 1, i32 undef>
; CHECK-NEXT: [[OR:%.*]] = or <2 x i32> [[SHF]], [[X]]
; CHECK-NEXT: [[RET:%.*]] = trunc <2 x i32> [[OR]] to <2 x i1>
; CHECK-NEXT: ret <2 x i1> [[RET]]
;
%shf = lshr <2 x i32> %x, <i32 1, i32 undef>
%or = or <2 x i32> %shf, %x
%and = and <2 x i32> %or, <i32 1, i32 1>
%ret = icmp ne <2 x i32> %and, zeroinitializer
ret <2 x i1> %ret
}
define <2 x i1> @icmp_and_or_lshr_cst_vec_commute(<2 x i32> %xp) {
; CHECK-LABEL: @icmp_and_or_lshr_cst_vec_commute(
; CHECK-NEXT: [[X:%.*]] = srem <2 x i32> [[XP:%.*]], <i32 42, i32 42>
@ -2731,6 +2745,22 @@ define <2 x i1> @icmp_and_or_lshr_cst_vec_nonuniform_commute(<2 x i32> %xp) {
ret <2 x i1> %ret
}
define <2 x i1> @icmp_and_or_lshr_cst_vec_undef_commute(<2 x i32> %xp) {
; CHECK-LABEL: @icmp_and_or_lshr_cst_vec_undef_commute(
; CHECK-NEXT: [[X:%.*]] = srem <2 x i32> [[XP:%.*]], <i32 42, i32 42>
; CHECK-NEXT: [[SHF:%.*]] = lshr <2 x i32> [[X]], <i32 1, i32 undef>
; CHECK-NEXT: [[OR:%.*]] = or <2 x i32> [[X]], [[SHF]]
; CHECK-NEXT: [[RET:%.*]] = trunc <2 x i32> [[OR]] to <2 x i1>
; CHECK-NEXT: ret <2 x i1> [[RET]]
;
%x = srem <2 x i32> %xp, <i32 42, i32 -42> ; prevent complexity-based canonicalization
%shf = lshr <2 x i32> %x, <i32 1, i32 undef>
%or = or <2 x i32> %x, %shf
%and = and <2 x i32> %or, <i32 1, i32 1>
%ret = icmp ne <2 x i32> %and, zeroinitializer
ret <2 x i1> %ret
}
define i1 @shl_ap1_zero_ap2_non_zero_2(i32 %a) {
; CHECK-LABEL: @shl_ap1_zero_ap2_non_zero_2(
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt i32 [[A:%.*]], 29