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[InstSimplify] add tests for select of true/false; NFC

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This commit is contained in:
Sanjay Patel 2020-01-08 16:22:14 -05:00
parent af36773fd6
commit 82519af5e2
1 changed files with 80 additions and 51 deletions
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131
test/Transforms/InstSimplify/select.ll
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@ -1,9 +1,36 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instsimplify -S | FileCheck %s
define i1 @bool_true_or_false(i1 %cond) {
; CHECK-LABEL: @bool_true_or_false(
; CHECK-NEXT: [[S:%.*]] = select i1 [[COND:%.*]], i1 true, i1 false
; CHECK-NEXT: ret i1 [[S]]
;
%s = select i1 %cond, i1 true, i1 false
ret i1 %s
}
define <2 x i1> @bool_true_or_false_vec(<2 x i1> %cond) {
; CHECK-LABEL: @bool_true_or_false_vec(
; CHECK-NEXT: [[S:%.*]] = select <2 x i1> [[COND:%.*]], <2 x i1> <i1 true, i1 true>, <2 x i1> zeroinitializer
; CHECK-NEXT: ret <2 x i1> [[S]]
;
%s = select <2 x i1> %cond, <2 x i1> <i1 true, i1 true>, <2 x i1> zeroinitializer
ret <2 x i1> %s
}
define <2 x i1> @bool_true_or_false_vec_undef(<2 x i1> %cond) {
; CHECK-LABEL: @bool_true_or_false_vec_undef(
; CHECK-NEXT: [[S:%.*]] = select <2 x i1> [[COND:%.*]], <2 x i1> <i1 undef, i1 true>, <2 x i1> <i1 false, i1 undef>
; CHECK-NEXT: ret <2 x i1> [[S]]
;
%s = select <2 x i1> %cond, <2 x i1> <i1 undef, i1 true>, <2 x i1> <i1 false, i1 undef>
ret <2 x i1> %s
}
define <2 x i8> @vsel_tvec(<2 x i8> %x, <2 x i8> %y) {
; CHECK-LABEL: @vsel_tvec(
; CHECK-NEXT: ret <2 x i8> %x
; CHECK-NEXT: ret <2 x i8> [[X:%.*]]
;
%s = select <2 x i1><i1 true, i1 true>, <2 x i8> %x, <2 x i8> %y
ret <2 x i8> %s
@ -11,7 +38,7 @@ define <2 x i8> @vsel_tvec(<2 x i8> %x, <2 x i8> %y) {
define <2 x i8> @vsel_fvec(<2 x i8> %x, <2 x i8> %y) {
; CHECK-LABEL: @vsel_fvec(
; CHECK-NEXT: ret <2 x i8> %y
; CHECK-NEXT: ret <2 x i8> [[Y:%.*]]
;
%s = select <2 x i1><i1 false, i1 false>, <2 x i8> %x, <2 x i8> %y
ret <2 x i8> %s
@ -47,7 +74,7 @@ define <3 x i4> @vsel_undef_false_op(<3 x i4> %x, <3 x i4> %y) {
define i32 @test1(i32 %x) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: ret i32 %x
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%and = and i32 %x, 1
%cmp = icmp eq i32 %and, 0
@ -58,7 +85,7 @@ define i32 @test1(i32 %x) {
define i32 @test2(i32 %x) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: ret i32 %x
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%and = and i32 %x, 1
%cmp = icmp ne i32 %and, 0
@ -69,7 +96,7 @@ define i32 @test2(i32 %x) {
define i32 @test3(i32 %x) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: [[AND1:%.*]] = and i32 %x, -2
; CHECK-NEXT: [[AND1:%.*]] = and i32 [[X:%.*]], -2
; CHECK-NEXT: ret i32 [[AND1]]
;
%and = and i32 %x, 1
@ -81,7 +108,7 @@ define i32 @test3(i32 %x) {
define i32 @test4(i32 %X) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: [[OR:%.*]] = or i32 %X, -2147483648
; CHECK-NEXT: [[OR:%.*]] = or i32 [[X:%.*]], -2147483648
; CHECK-NEXT: ret i32 [[OR]]
;
%cmp = icmp slt i32 %X, 0
@ -104,7 +131,7 @@ define i32 @test4noncanon(i32 %X) {
define i32 @test5(i32 %X) {
; CHECK-LABEL: @test5(
; CHECK-NEXT: ret i32 %X
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%cmp = icmp slt i32 %X, 0
%or = or i32 %X, -2147483648
@ -114,7 +141,7 @@ define i32 @test5(i32 %X) {
define i32 @test6(i32 %X) {
; CHECK-LABEL: @test6(
; CHECK-NEXT: [[AND:%.*]] = and i32 %X, 2147483647
; CHECK-NEXT: [[AND:%.*]] = and i32 [[X:%.*]], 2147483647
; CHECK-NEXT: ret i32 [[AND]]
;
%cmp = icmp slt i32 %X, 0
@ -125,7 +152,7 @@ define i32 @test6(i32 %X) {
define i32 @test7(i32 %X) {
; CHECK-LABEL: @test7(
; CHECK-NEXT: ret i32 %X
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%cmp = icmp slt i32 %X, 0
%and = and i32 %X, 2147483647
@ -135,7 +162,7 @@ define i32 @test7(i32 %X) {
define i32 @test8(i32 %X) {
; CHECK-LABEL: @test8(
; CHECK-NEXT: ret i32 %X
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%cmp = icmp sgt i32 %X, -1
%or = or i32 %X, -2147483648
@ -145,7 +172,7 @@ define i32 @test8(i32 %X) {
define i32 @test9(i32 %X) {
; CHECK-LABEL: @test9(
; CHECK-NEXT: [[OR:%.*]] = or i32 %X, -2147483648
; CHECK-NEXT: [[OR:%.*]] = or i32 [[X:%.*]], -2147483648
; CHECK-NEXT: ret i32 [[OR]]
;
%cmp = icmp sgt i32 %X, -1
@ -168,7 +195,7 @@ define i32 @test9noncanon(i32 %X) {
define i32 @test10(i32 %X) {
; CHECK-LABEL: @test10(
; CHECK-NEXT: ret i32 %X
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%cmp = icmp sgt i32 %X, -1
%and = and i32 %X, 2147483647
@ -178,7 +205,7 @@ define i32 @test10(i32 %X) {
define i32 @test11(i32 %X) {
; CHECK-LABEL: @test11(
; CHECK-NEXT: [[AND:%.*]] = and i32 %X, 2147483647
; CHECK-NEXT: [[AND:%.*]] = and i32 [[X:%.*]], 2147483647
; CHECK-NEXT: ret i32 [[AND]]
;
%cmp = icmp sgt i32 %X, -1
@ -189,7 +216,7 @@ define i32 @test11(i32 %X) {
define <2 x i8> @test11vec(<2 x i8> %X) {
; CHECK-LABEL: @test11vec(
; CHECK-NEXT: [[AND:%.*]] = and <2 x i8> %X, <i8 127, i8 127>
; CHECK-NEXT: [[AND:%.*]] = and <2 x i8> [[X:%.*]], <i8 127, i8 127>
; CHECK-NEXT: ret <2 x i8> [[AND]]
;
%cmp = icmp sgt <2 x i8> %X, <i8 -1, i8 -1>
@ -246,7 +273,7 @@ define i32 @test13noncanon(i32 %X) {
define i32 @select_icmp_and_8_eq_0_or_8(i32 %x) {
; CHECK-LABEL: @select_icmp_and_8_eq_0_or_8(
; CHECK-NEXT: [[OR:%.*]] = or i32 %x, 8
; CHECK-NEXT: [[OR:%.*]] = or i32 [[X:%.*]], 8
; CHECK-NEXT: ret i32 [[OR]]
;
%and = and i32 %x, 8
@ -258,7 +285,7 @@ define i32 @select_icmp_and_8_eq_0_or_8(i32 %x) {
define i32 @select_icmp_and_8_eq_0_or_8_alt(i32 %x) {
; CHECK-LABEL: @select_icmp_and_8_eq_0_or_8_alt(
; CHECK-NEXT: [[OR:%.*]] = or i32 %x, 8
; CHECK-NEXT: [[OR:%.*]] = or i32 [[X:%.*]], 8
; CHECK-NEXT: ret i32 [[OR]]
;
%and = and i32 %x, 8
@ -270,7 +297,7 @@ define i32 @select_icmp_and_8_eq_0_or_8_alt(i32 %x) {
define i32 @select_icmp_and_8_ne_0_or_8(i32 %x) {
; CHECK-LABEL: @select_icmp_and_8_ne_0_or_8(
; CHECK-NEXT: ret i32 %x
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%and = and i32 %x, 8
%cmp = icmp ne i32 %and, 0
@ -281,7 +308,7 @@ define i32 @select_icmp_and_8_ne_0_or_8(i32 %x) {
define i32 @select_icmp_and_8_ne_0_or_8_alt(i32 %x) {
; CHECK-LABEL: @select_icmp_and_8_ne_0_or_8_alt(
; CHECK-NEXT: ret i32 %x
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%and = and i32 %x, 8
%cmp = icmp eq i32 %and, 0
@ -292,7 +319,7 @@ define i32 @select_icmp_and_8_ne_0_or_8_alt(i32 %x) {
define i32 @select_icmp_and_8_eq_0_and_not_8(i32 %x) {
; CHECK-LABEL: @select_icmp_and_8_eq_0_and_not_8(
; CHECK-NEXT: [[AND1:%.*]] = and i32 %x, -9
; CHECK-NEXT: [[AND1:%.*]] = and i32 [[X:%.*]], -9
; CHECK-NEXT: ret i32 [[AND1]]
;
%and = and i32 %x, 8
@ -304,7 +331,7 @@ define i32 @select_icmp_and_8_eq_0_and_not_8(i32 %x) {
define i32 @select_icmp_and_8_eq_0_and_not_8_alt(i32 %x) {
; CHECK-LABEL: @select_icmp_and_8_eq_0_and_not_8_alt(
; CHECK-NEXT: [[AND1:%.*]] = and i32 %x, -9
; CHECK-NEXT: [[AND1:%.*]] = and i32 [[X:%.*]], -9
; CHECK-NEXT: ret i32 [[AND1]]
;
%and = and i32 %x, 8
@ -316,7 +343,7 @@ define i32 @select_icmp_and_8_eq_0_and_not_8_alt(i32 %x) {
define i32 @select_icmp_and_8_ne_0_and_not_8(i32 %x) {
; CHECK-LABEL: @select_icmp_and_8_ne_0_and_not_8(
; CHECK-NEXT: ret i32 %x
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%and = and i32 %x, 8
%cmp = icmp ne i32 %and, 0
@ -327,7 +354,7 @@ define i32 @select_icmp_and_8_ne_0_and_not_8(i32 %x) {
define i32 @select_icmp_and_8_ne_0_and_not_8_alt(i32 %x) {
; CHECK-LABEL: @select_icmp_and_8_ne_0_and_not_8_alt(
; CHECK-NEXT: ret i32 %x
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%and = and i32 %x, 8
%cmp = icmp eq i32 %and, 0
@ -342,7 +369,7 @@ define i32 @select_icmp_and_8_ne_0_and_not_8_alt(i32 %x) {
define i32 @select_icmp_trunc_8_ne_0_or_128(i32 %x) {
; CHECK-LABEL: @select_icmp_trunc_8_ne_0_or_128(
; CHECK-NEXT: [[OR:%.*]] = or i32 %x, 128
; CHECK-NEXT: [[OR:%.*]] = or i32 [[X:%.*]], 128
; CHECK-NEXT: ret i32 [[OR]]
;
%trunc = trunc i32 %x to i8
@ -354,7 +381,7 @@ define i32 @select_icmp_trunc_8_ne_0_or_128(i32 %x) {
define i32 @select_icmp_trunc_8_ne_0_or_128_alt(i32 %x) {
; CHECK-LABEL: @select_icmp_trunc_8_ne_0_or_128_alt(
; CHECK-NEXT: [[OR:%.*]] = or i32 %x, 128
; CHECK-NEXT: [[OR:%.*]] = or i32 [[X:%.*]], 128
; CHECK-NEXT: ret i32 [[OR]]
;
%trunc = trunc i32 %x to i8
@ -366,7 +393,7 @@ define i32 @select_icmp_trunc_8_ne_0_or_128_alt(i32 %x) {
define i32 @select_icmp_trunc_8_eq_0_or_128(i32 %x) {
; CHECK-LABEL: @select_icmp_trunc_8_eq_0_or_128(
; CHECK-NEXT: ret i32 %x
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%trunc = trunc i32 %x to i8
%cmp = icmp slt i8 %trunc, 0
@ -377,7 +404,7 @@ define i32 @select_icmp_trunc_8_eq_0_or_128(i32 %x) {
define i32 @select_icmp_trunc_8_eq_0_or_128_alt(i32 %x) {
; CHECK-LABEL: @select_icmp_trunc_8_eq_0_or_128_alt(
; CHECK-NEXT: ret i32 %x
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%trunc = trunc i32 %x to i8
%cmp = icmp sgt i8 %trunc, -1
@ -388,7 +415,7 @@ define i32 @select_icmp_trunc_8_eq_0_or_128_alt(i32 %x) {
define i32 @select_icmp_trunc_8_eq_0_and_not_8(i32 %x) {
; CHECK-LABEL: @select_icmp_trunc_8_eq_0_and_not_8(
; CHECK-NEXT: [[AND:%.*]] = and i32 %x, -9
; CHECK-NEXT: [[AND:%.*]] = and i32 [[X:%.*]], -9
; CHECK-NEXT: ret i32 [[AND]]
;
%trunc = trunc i32 %x to i4
@ -400,7 +427,7 @@ define i32 @select_icmp_trunc_8_eq_0_and_not_8(i32 %x) {
define i32 @select_icmp_trunc_8_eq_0_and_not_8_alt(i32 %x) {
; CHECK-LABEL: @select_icmp_trunc_8_eq_0_and_not_8_alt(
; CHECK-NEXT: [[AND:%.*]] = and i32 %x, -9
; CHECK-NEXT: [[AND:%.*]] = and i32 [[X:%.*]], -9
; CHECK-NEXT: ret i32 [[AND]]
;
%trunc = trunc i32 %x to i4
@ -412,7 +439,7 @@ define i32 @select_icmp_trunc_8_eq_0_and_not_8_alt(i32 %x) {
define i32 @select_icmp_trunc_8_ne_0_and_not_8(i32 %x) {
; CHECK-LABEL: @select_icmp_trunc_8_ne_0_and_not_8(
; CHECK-NEXT: ret i32 %x
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%trunc = trunc i32 %x to i4
%cmp = icmp slt i4 %trunc, 0
@ -423,7 +450,7 @@ define i32 @select_icmp_trunc_8_ne_0_and_not_8(i32 %x) {
define i32 @select_icmp_trunc_8_ne_0_and_not_8_alt(i32 %x) {
; CHECK-LABEL: @select_icmp_trunc_8_ne_0_and_not_8_alt(
; CHECK-NEXT: ret i32 %x
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%trunc = trunc i32 %x to i4
%cmp = icmp sgt i4 %trunc, -1
@ -436,7 +463,7 @@ define i32 @select_icmp_trunc_8_ne_0_and_not_8_alt(i32 %x) {
define <2 x i32> @select_icmp_and_8_ne_0_and_not_8_vec(<2 x i32> %x) {
; CHECK-LABEL: @select_icmp_and_8_ne_0_and_not_8_vec(
; CHECK-NEXT: ret <2 x i32> %x
; CHECK-NEXT: ret <2 x i32> [[X:%.*]]
;
%and = and <2 x i32> %x, <i32 8, i32 8>
%cmp = icmp ne <2 x i32> %and, zeroinitializer
@ -447,7 +474,7 @@ define <2 x i32> @select_icmp_and_8_ne_0_and_not_8_vec(<2 x i32> %x) {
define <2 x i32> @select_icmp_trunc_8_ne_0_and_not_8_alt_vec(<2 x i32> %x) {
; CHECK-LABEL: @select_icmp_trunc_8_ne_0_and_not_8_alt_vec(
; CHECK-NEXT: ret <2 x i32> %x
; CHECK-NEXT: ret <2 x i32> [[X:%.*]]
;
%trunc = trunc <2 x i32> %x to <2 x i4>
%cmp = icmp sgt <2 x i4> %trunc, <i4 -1, i4 -1>
@ -460,10 +487,10 @@ define <2 x i32> @select_icmp_trunc_8_ne_0_and_not_8_alt_vec(<2 x i32> %x) {
define i32 @select_icmp_x_and_8_eq_0_y_and_not_8(i32 %x, i32 %y) {
; CHECK-LABEL: @select_icmp_x_and_8_eq_0_y_and_not_8(
; CHECK-NEXT: [[AND:%.*]] = and i32 %x, 8
; CHECK-NEXT: [[AND:%.*]] = and i32 [[X:%.*]], 8
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[AND]], 0
; CHECK-NEXT: [[AND1:%.*]] = and i32 %y, -9
; CHECK-NEXT: [[Y_AND1:%.*]] = select i1 [[CMP]], i32 %y, i32 [[AND1]]
; CHECK-NEXT: [[AND1:%.*]] = and i32 [[Y:%.*]], -9
; CHECK-NEXT: [[Y_AND1:%.*]] = select i1 [[CMP]], i32 [[Y]], i32 [[AND1]]
; CHECK-NEXT: ret i32 [[Y_AND1]]
;
%and = and i32 %x, 8
@ -475,10 +502,10 @@ define i32 @select_icmp_x_and_8_eq_0_y_and_not_8(i32 %x, i32 %y) {
define i64 @select_icmp_x_and_8_eq_0_y64_and_not_8(i32 %x, i64 %y) {
; CHECK-LABEL: @select_icmp_x_and_8_eq_0_y64_and_not_8(
; CHECK-NEXT: [[AND:%.*]] = and i32 %x, 8
; CHECK-NEXT: [[AND:%.*]] = and i32 [[X:%.*]], 8
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[AND]], 0
; CHECK-NEXT: [[AND1:%.*]] = and i64 %y, -9
; CHECK-NEXT: [[Y_AND1:%.*]] = select i1 [[CMP]], i64 %y, i64 [[AND1]]
; CHECK-NEXT: [[AND1:%.*]] = and i64 [[Y:%.*]], -9
; CHECK-NEXT: [[Y_AND1:%.*]] = select i1 [[CMP]], i64 [[Y]], i64 [[AND1]]
; CHECK-NEXT: ret i64 [[Y_AND1]]
;
%and = and i32 %x, 8
@ -490,10 +517,10 @@ define i64 @select_icmp_x_and_8_eq_0_y64_and_not_8(i32 %x, i64 %y) {
define i64 @select_icmp_x_and_8_ne_0_y64_and_not_8(i32 %x, i64 %y) {
; CHECK-LABEL: @select_icmp_x_and_8_ne_0_y64_and_not_8(
; CHECK-NEXT: [[AND:%.*]] = and i32 %x, 8
; CHECK-NEXT: [[AND:%.*]] = and i32 [[X:%.*]], 8
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[AND]], 0
; CHECK-NEXT: [[AND1:%.*]] = and i64 %y, -9
; CHECK-NEXT: [[AND1_Y:%.*]] = select i1 [[CMP]], i64 [[AND1]], i64 %y
; CHECK-NEXT: [[AND1:%.*]] = and i64 [[Y:%.*]], -9
; CHECK-NEXT: [[AND1_Y:%.*]] = select i1 [[CMP]], i64 [[AND1]], i64 [[Y]]
; CHECK-NEXT: ret i64 [[AND1_Y]]
;
%and = and i32 %x, 8
@ -507,8 +534,8 @@ define i64 @select_icmp_x_and_8_ne_0_y64_and_not_8(i32 %x, i64 %y) {
define i32* @select_icmp_pointers(i32* %x, i32* %y) {
; CHECK-LABEL: @select_icmp_pointers(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32* %x, null
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP]], i32* %x, i32* %y
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32* [[X:%.*]], null
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP]], i32* [[X]], i32* [[Y:%.*]]
; CHECK-NEXT: ret i32* [[SEL]]
;
%cmp = icmp slt i32* %x, null
@ -523,8 +550,8 @@ declare void @llvm.assume(i1)
define i8 @assume_sel_cond(i1 %cond, i8 %x, i8 %y) {
; CHECK-LABEL: @assume_sel_cond(
; CHECK-NEXT: call void @llvm.assume(i1 %cond)
; CHECK-NEXT: [[SEL:%.*]] = select i1 %cond, i8 %x, i8 %y
; CHECK-NEXT: call void @llvm.assume(i1 [[COND:%.*]])
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[COND]], i8 [[X:%.*]], i8 [[Y:%.*]]
; CHECK-NEXT: ret i8 [[SEL]]
;
call void @llvm.assume(i1 %cond)
@ -534,9 +561,9 @@ define i8 @assume_sel_cond(i1 %cond, i8 %x, i8 %y) {
define i8 @do_not_assume_sel_cond(i1 %cond, i8 %x, i8 %y) {
; CHECK-LABEL: @do_not_assume_sel_cond(
; CHECK-NEXT: [[NOTCOND:%.*]] = icmp eq i1 %cond, false
; CHECK-NEXT: [[NOTCOND:%.*]] = icmp eq i1 [[COND:%.*]], false
; CHECK-NEXT: call void @llvm.assume(i1 [[NOTCOND]])
; CHECK-NEXT: [[SEL:%.*]] = select i1 %cond, i8 %x, i8 %y
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[COND]], i8 [[X:%.*]], i8 [[Y:%.*]]
; CHECK-NEXT: ret i8 [[SEL]]
;
%notcond = icmp eq i1 %cond, false
@ -547,8 +574,9 @@ define i8 @do_not_assume_sel_cond(i1 %cond, i8 %x, i8 %y) {
define i32* @select_icmp_eq_0_gep_operand(i32* %base, i64 %n) {
; CHECK-LABEL: @select_icmp_eq_0_gep_operand(
; CHECK-NEXT: [[GEP:%.*]] = getelementptr
; CHECK-NEXT: ret i32* [[GEP]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i32, i32* [[BASE:%.*]], i64 [[N:%.*]]
; CHECK-NEXT: ret i32* [[GEP]]
;
%cond = icmp eq i64 %n, 0
%gep = getelementptr i32, i32* %base, i64 %n
%r = select i1 %cond, i32* %base, i32* %gep
@ -557,8 +585,9 @@ define i32* @select_icmp_eq_0_gep_operand(i32* %base, i64 %n) {
define i32* @select_icmp_ne_0_gep_operand(i32* %base, i64 %n) {
; CHECK-LABEL: @select_icmp_ne_0_gep_operand(
; CHECK-NEXT: [[GEP:%.*]] = getelementptr
; CHECK-NEXT: ret i32* [[GEP]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i32, i32* [[BASE:%.*]], i64 [[N:%.*]]
; CHECK-NEXT: ret i32* [[GEP]]
;
%cond = icmp ne i64 %n, 0
%gep = getelementptr i32, i32* %base, i64 %n
%r = select i1 %cond, i32* %gep, i32* %base