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-rw-r--r--test/Transforms/InstCombine/demorgan.ll501
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diff --git a/test/Transforms/InstCombine/demorgan.ll b/test/Transforms/InstCombine/demorgan.ll
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+++ b/test/Transforms/InstCombine/demorgan.ll
@@ -0,0 +1,501 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+; (~A | ~B) == ~(A & B)
+
+define i43 @demorgan_or_apint1(i43 %A, i43 %B) {
+; CHECK-LABEL: @demorgan_or_apint1(
+; CHECK-NEXT: [[C_DEMORGAN:%.*]] = and i43 %A, %B
+; CHECK-NEXT: [[C:%.*]] = xor i43 [[C_DEMORGAN]], -1
+; CHECK-NEXT: ret i43 [[C]]
+;
+ %NotA = xor i43 %A, -1
+ %NotB = xor i43 %B, -1
+ %C = or i43 %NotA, %NotB
+ ret i43 %C
+}
+
+; (~A | ~B) == ~(A & B)
+
+define i129 @demorgan_or_apint2(i129 %A, i129 %B) {
+; CHECK-LABEL: @demorgan_or_apint2(
+; CHECK-NEXT: [[C_DEMORGAN:%.*]] = and i129 %A, %B
+; CHECK-NEXT: [[C:%.*]] = xor i129 [[C_DEMORGAN]], -1
+; CHECK-NEXT: ret i129 [[C]]
+;
+ %NotA = xor i129 %A, -1
+ %NotB = xor i129 %B, -1
+ %C = or i129 %NotA, %NotB
+ ret i129 %C
+}
+
+; (~A & ~B) == ~(A | B)
+
+define i477 @demorgan_and_apint1(i477 %A, i477 %B) {
+; CHECK-LABEL: @demorgan_and_apint1(
+; CHECK-NEXT: [[C_DEMORGAN:%.*]] = or i477 %A, %B
+; CHECK-NEXT: [[C:%.*]] = xor i477 [[C_DEMORGAN]], -1
+; CHECK-NEXT: ret i477 [[C]]
+;
+ %NotA = xor i477 %A, -1
+ %NotB = xor i477 %B, -1
+ %C = and i477 %NotA, %NotB
+ ret i477 %C
+}
+
+; (~A & ~B) == ~(A | B)
+
+define i129 @demorgan_and_apint2(i129 %A, i129 %B) {
+; CHECK-LABEL: @demorgan_and_apint2(
+; CHECK-NEXT: [[C_DEMORGAN:%.*]] = or i129 %A, %B
+; CHECK-NEXT: [[C:%.*]] = xor i129 [[C_DEMORGAN]], -1
+; CHECK-NEXT: ret i129 [[C]]
+;
+ %NotA = xor i129 %A, -1
+ %NotB = xor i129 %B, -1
+ %C = and i129 %NotA, %NotB
+ ret i129 %C
+}
+
+; (~A & ~B) == ~(A | B)
+
+define i65 @demorgan_and_apint3(i65 %A, i65 %B) {
+; CHECK-LABEL: @demorgan_and_apint3(
+; CHECK-NEXT: [[C_DEMORGAN:%.*]] = or i65 %A, %B
+; CHECK-NEXT: [[C:%.*]] = xor i65 [[C_DEMORGAN]], -1
+; CHECK-NEXT: ret i65 [[C]]
+;
+ %NotA = xor i65 %A, -1
+ %NotB = xor i65 -1, %B
+ %C = and i65 %NotA, %NotB
+ ret i65 %C
+}
+
+; (~A & ~B) == ~(A | B)
+
+define i66 @demorgan_and_apint4(i66 %A, i66 %B) {
+; CHECK-LABEL: @demorgan_and_apint4(
+; CHECK-NEXT: [[C_DEMORGAN:%.*]] = or i66 %A, %B
+; CHECK-NEXT: [[C:%.*]] = xor i66 [[C_DEMORGAN]], -1
+; CHECK-NEXT: ret i66 [[C]]
+;
+ %NotA = xor i66 %A, -1
+ %NotB = xor i66 %B, -1
+ %C = and i66 %NotA, %NotB
+ ret i66 %C
+}
+
+; (~A & ~B) == ~(A | B)
+
+define i47 @demorgan_and_apint5(i47 %A, i47 %B) {
+; CHECK-LABEL: @demorgan_and_apint5(
+; CHECK-NEXT: [[C_DEMORGAN:%.*]] = or i47 %A, %B
+; CHECK-NEXT: [[C:%.*]] = xor i47 [[C_DEMORGAN]], -1
+; CHECK-NEXT: ret i47 [[C]]
+;
+ %NotA = xor i47 %A, -1
+ %NotB = xor i47 %B, -1
+ %C = and i47 %NotA, %NotB
+ ret i47 %C
+}
+
+; This is confirming that 2 transforms work together:
+; ~(~A & ~B) --> A | B
+
+define i32 @test3(i32 %A, i32 %B) {
+; CHECK-LABEL: @test3(
+; CHECK-NEXT: [[C_DEMORGAN:%.*]] = or i32 %A, %B
+; CHECK-NEXT: ret i32 [[C_DEMORGAN]]
+;
+ %nota = xor i32 %A, -1
+ %notb = xor i32 %B, -1
+ %c = and i32 %nota, %notb
+ %notc = xor i32 %c, -1
+ ret i32 %notc
+}
+
+; Invert a constant if needed:
+; ~(~A & 5) --> A | ~5
+
+define i32 @test4(i32 %A) {
+; CHECK-LABEL: @test4(
+; CHECK-NEXT: [[NOTC1:%.*]] = or i32 %A, -6
+; CHECK-NEXT: ret i32 [[NOTC1]]
+;
+ %nota = xor i32 %A, -1
+ %c = and i32 %nota, 5
+ %notc = xor i32 %c, -1
+ ret i32 %notc
+}
+
+; Test the mirror of DeMorgan's law with an extra 'not'.
+; ~(~A | ~B) --> A & B
+
+define i32 @test5(i32 %A, i32 %B) {
+; CHECK-LABEL: @test5(
+; CHECK-NEXT: [[C_DEMORGAN:%.*]] = and i32 %A, %B
+; CHECK-NEXT: ret i32 [[C_DEMORGAN]]
+;
+ %nota = xor i32 %A, -1
+ %notb = xor i32 %B, -1
+ %c = or i32 %nota, %notb
+ %notc = xor i32 %c, -1
+ ret i32 %notc
+}
+
+; Repeat with weird types for extra coverage.
+; ~(~A & ~B) --> A | B
+
+define i47 @test3_apint(i47 %A, i47 %B) {
+; CHECK-LABEL: @test3_apint(
+; CHECK-NEXT: [[C_DEMORGAN:%.*]] = or i47 %A, %B
+; CHECK-NEXT: ret i47 [[C_DEMORGAN]]
+;
+ %nota = xor i47 %A, -1
+ %notb = xor i47 %B, -1
+ %c = and i47 %nota, %notb
+ %notc = xor i47 %c, -1
+ ret i47 %notc
+}
+
+; ~(~A & 5) --> A | ~5
+
+define i61 @test4_apint(i61 %A) {
+; CHECK-LABEL: @test4_apint(
+; CHECK-NEXT: [[NOTA:%.*]] = and i61 %A, 5
+; CHECK-NEXT: [[C:%.*]] = xor i61 [[NOTA]], 5
+; CHECK-NEXT: ret i61 [[C]]
+;
+ %nota = xor i61 %A, -1
+ %c = and i61 %nota, 5 ; 5 = ~c2
+ %notc = xor i61 %c, -1
+ ret i61 %c
+}
+
+; ~(~A | ~B) --> A & B
+
+define i71 @test5_apint(i71 %A, i71 %B) {
+; CHECK-LABEL: @test5_apint(
+; CHECK-NEXT: [[C_DEMORGAN:%.*]] = and i71 %A, %B
+; CHECK-NEXT: ret i71 [[C_DEMORGAN]]
+;
+ %nota = xor i71 %A, -1
+ %notb = xor i71 %B, -1
+ %c = or i71 %nota, %notb
+ %notc = xor i71 %c, -1
+ ret i71 %notc
+}
+
+; ~(~A & B) --> (A | ~B)
+
+define i8 @demorgan_nand(i8 %A, i8 %B) {
+; CHECK-LABEL: @demorgan_nand(
+; CHECK-NEXT: [[B_NOT:%.*]] = xor i8 %B, -1
+; CHECK-NEXT: [[NOTC:%.*]] = or i8 [[B_NOT]], %A
+; CHECK-NEXT: ret i8 [[NOTC]]
+;
+ %notx = xor i8 %A, -1
+ %c = and i8 %notx, %B
+ %notc = xor i8 %c, -1
+ ret i8 %notc
+}
+
+; ~(~A & B) --> (A | ~B)
+
+define i7 @demorgan_nand_apint1(i7 %A, i7 %B) {
+; CHECK-LABEL: @demorgan_nand_apint1(
+; CHECK-NEXT: [[B_NOT:%.*]] = xor i7 %B, -1
+; CHECK-NEXT: [[NOTC:%.*]] = or i7 [[B_NOT]], %A
+; CHECK-NEXT: ret i7 [[NOTC]]
+;
+ %nota = xor i7 %A, -1
+ %c = and i7 %nota, %B
+ %notc = xor i7 %c, -1
+ ret i7 %notc
+}
+
+; ~(~A & B) --> (A | ~B)
+
+define i117 @demorgan_nand_apint2(i117 %A, i117 %B) {
+; CHECK-LABEL: @demorgan_nand_apint2(
+; CHECK-NEXT: [[B_NOT:%.*]] = xor i117 %B, -1
+; CHECK-NEXT: [[NOTC:%.*]] = or i117 [[B_NOT]], %A
+; CHECK-NEXT: ret i117 [[NOTC]]
+;
+ %nota = xor i117 %A, -1
+ %c = and i117 %nota, %B
+ %notc = xor i117 %c, -1
+ ret i117 %notc
+}
+
+; ~(~A | B) --> (A & ~B)
+
+define i8 @demorgan_nor(i8 %A, i8 %B) {
+; CHECK-LABEL: @demorgan_nor(
+; CHECK-NEXT: [[B_NOT:%.*]] = xor i8 %B, -1
+; CHECK-NEXT: [[NOTC:%.*]] = and i8 [[B_NOT]], %A
+; CHECK-NEXT: ret i8 [[NOTC]]
+;
+ %notx = xor i8 %A, -1
+ %c = or i8 %notx, %B
+ %notc = xor i8 %c, -1
+ ret i8 %notc
+}
+
+; ~(~A | B) --> (A & ~B) - what if we use one of the intermediate results?
+
+define i8 @demorgan_nor_use2a(i8 %A, i8 %B) {
+; CHECK-LABEL: @demorgan_nor_use2a(
+; CHECK-NEXT: [[NOTA:%.*]] = xor i8 %A, -1
+; CHECK-NEXT: [[USE2A:%.*]] = mul i8 [[NOTA]], 23
+; CHECK-NEXT: [[B_NOT:%.*]] = xor i8 %B, -1
+; CHECK-NEXT: [[NOTC:%.*]] = and i8 [[B_NOT]], %A
+; CHECK-NEXT: [[R:%.*]] = sdiv i8 [[NOTC]], [[USE2A]]
+; CHECK-NEXT: ret i8 [[R]]
+;
+ %nota = xor i8 %A, -1
+ %use2a = mul i8 %nota, 23
+ %c = or i8 %nota, %B
+ %notc = xor i8 %c, -1
+ %r = sdiv i8 %notc, %use2a
+ ret i8 %r
+}
+
+; ~(~A | B) --> (A & ~B) - what if we use one of the intermediate results?
+
+define i8 @demorgan_nor_use2b(i8 %A, i8 %B) {
+; CHECK-LABEL: @demorgan_nor_use2b(
+; CHECK-NEXT: [[USE2B:%.*]] = mul i8 %B, 23
+; CHECK-NEXT: [[B_NOT:%.*]] = xor i8 %B, -1
+; CHECK-NEXT: [[NOTC:%.*]] = and i8 [[B_NOT]], %A
+; CHECK-NEXT: [[R:%.*]] = sdiv i8 [[NOTC]], [[USE2B]]
+; CHECK-NEXT: ret i8 [[R]]
+;
+ %use2b = mul i8 %B, 23
+ %nota = xor i8 %A, -1
+ %c = or i8 %nota, %B
+ %notc = xor i8 %c, -1
+ %r = sdiv i8 %notc, %use2b
+ ret i8 %r
+}
+
+; ~(~A | B) --> (A & ~B) - what if we use one of the intermediate results?
+
+define i8 @demorgan_nor_use2c(i8 %A, i8 %B) {
+; CHECK-LABEL: @demorgan_nor_use2c(
+; CHECK-NEXT: [[NOTA:%.*]] = xor i8 %A, -1
+; CHECK-NEXT: [[C:%.*]] = or i8 [[NOTA]], %B
+; CHECK-NEXT: [[USE2C:%.*]] = mul i8 [[C]], 23
+; CHECK-NEXT: [[NOTC:%.*]] = xor i8 [[C]], -1
+; CHECK-NEXT: [[R:%.*]] = sdiv i8 [[NOTC]], [[USE2C]]
+; CHECK-NEXT: ret i8 [[R]]
+;
+ %nota = xor i8 %A, -1
+ %c = or i8 %nota, %B
+ %use2c = mul i8 %c, 23
+ %notc = xor i8 %c, -1
+ %r = sdiv i8 %notc, %use2c
+ ret i8 %r
+}
+
+; ~(~A | B) --> (A & ~B) - what if we use two of the intermediate results?
+
+define i8 @demorgan_nor_use2ab(i8 %A, i8 %B) {
+; CHECK-LABEL: @demorgan_nor_use2ab(
+; CHECK-NEXT: [[USE2B:%.*]] = mul i8 %B, 23
+; CHECK-NEXT: [[NOTA:%.*]] = xor i8 %A, -1
+; CHECK-NEXT: [[USE2A:%.*]] = mul i8 [[NOTA]], 17
+; CHECK-NEXT: [[B_NOT:%.*]] = xor i8 %B, -1
+; CHECK-NEXT: [[NOTC:%.*]] = and i8 [[B_NOT]], %A
+; CHECK-NEXT: [[R1:%.*]] = sdiv i8 [[NOTC]], [[USE2B]]
+; CHECK-NEXT: [[R2:%.*]] = sdiv i8 [[R1]], [[USE2A]]
+; CHECK-NEXT: ret i8 [[R2]]
+;
+ %use2b = mul i8 %B, 23
+ %nota = xor i8 %A, -1
+ %use2a = mul i8 %nota, 17
+ %c = or i8 %nota, %B
+ %notc = xor i8 %c, -1
+ %r1 = sdiv i8 %notc, %use2b
+ %r2 = sdiv i8 %r1, %use2a
+ ret i8 %r2
+}
+
+; ~(~A | B) --> (A & ~B) - what if we use two of the intermediate results?
+
+define i8 @demorgan_nor_use2ac(i8 %A, i8 %B) {
+; CHECK-LABEL: @demorgan_nor_use2ac(
+; CHECK-NEXT: [[NOTA:%.*]] = xor i8 %A, -1
+; CHECK-NEXT: [[USE2A:%.*]] = mul i8 [[NOTA]], 17
+; CHECK-NEXT: [[C:%.*]] = or i8 [[NOTA]], %B
+; CHECK-NEXT: [[USE2C:%.*]] = mul i8 [[C]], 23
+; CHECK-NEXT: [[NOTC:%.*]] = xor i8 [[C]], -1
+; CHECK-NEXT: [[R1:%.*]] = sdiv i8 [[NOTC]], [[USE2C]]
+; CHECK-NEXT: [[R2:%.*]] = sdiv i8 [[R1]], [[USE2A]]
+; CHECK-NEXT: ret i8 [[R2]]
+;
+ %nota = xor i8 %A, -1
+ %use2a = mul i8 %nota, 17
+ %c = or i8 %nota, %B
+ %use2c = mul i8 %c, 23
+ %notc = xor i8 %c, -1
+ %r1 = sdiv i8 %notc, %use2c
+ %r2 = sdiv i8 %r1, %use2a
+ ret i8 %r2
+}
+
+; ~(~A | B) --> (A & ~B) - what if we use two of the intermediate results?
+
+define i8 @demorgan_nor_use2bc(i8 %A, i8 %B) {
+; CHECK-LABEL: @demorgan_nor_use2bc(
+; CHECK-NEXT: [[USE2B:%.*]] = mul i8 %B, 23
+; CHECK-NEXT: [[NOTA:%.*]] = xor i8 %A, -1
+; CHECK-NEXT: [[C:%.*]] = or i8 [[NOTA]], %B
+; CHECK-NEXT: [[USE2C:%.*]] = mul i8 [[C]], 23
+; CHECK-NEXT: [[NOTC:%.*]] = xor i8 [[C]], -1
+; CHECK-NEXT: [[R1:%.*]] = sdiv i8 [[NOTC]], [[USE2C]]
+; CHECK-NEXT: [[R2:%.*]] = sdiv i8 [[R1]], [[USE2B]]
+; CHECK-NEXT: ret i8 [[R2]]
+;
+ %use2b = mul i8 %B, 23
+ %nota = xor i8 %A, -1
+ %c = or i8 %nota, %B
+ %use2c = mul i8 %c, 23
+ %notc = xor i8 %c, -1
+ %r1 = sdiv i8 %notc, %use2c
+ %r2 = sdiv i8 %r1, %use2b
+ ret i8 %r2
+}
+
+; Do not apply DeMorgan's Law to constants. We prefer 'not' ops.
+
+define i32 @demorganize_constant1(i32 %a) {
+; CHECK-LABEL: @demorganize_constant1(
+; CHECK-NEXT: [[AND:%.*]] = and i32 %a, 15
+; CHECK-NEXT: [[AND1:%.*]] = xor i32 [[AND]], -1
+; CHECK-NEXT: ret i32 [[AND1]]
+;
+ %and = and i32 %a, 15
+ %and1 = xor i32 %and, -1
+ ret i32 %and1
+}
+
+; Do not apply DeMorgan's Law to constants. We prefer 'not' ops.
+
+define i32 @demorganize_constant2(i32 %a) {
+; CHECK-LABEL: @demorganize_constant2(
+; CHECK-NEXT: [[AND:%.*]] = or i32 %a, 15
+; CHECK-NEXT: [[AND1:%.*]] = xor i32 [[AND]], -1
+; CHECK-NEXT: ret i32 [[AND1]]
+;
+ %and = or i32 %a, 15
+ %and1 = xor i32 %and, -1
+ ret i32 %and1
+}
+
+; PR22723: Recognize DeMorgan's Laws when obfuscated by zexts.
+
+define i32 @demorgan_or_zext(i1 %X, i1 %Y) {
+; CHECK-LABEL: @demorgan_or_zext(
+; CHECK-NEXT: [[OR1_DEMORGAN:%.*]] = and i1 %X, %Y
+; CHECK-NEXT: [[OR1:%.*]] = xor i1 [[OR1_DEMORGAN]], true
+; CHECK-NEXT: [[OR:%.*]] = zext i1 [[OR:%.*]]1 to i32
+; CHECK-NEXT: ret i32 [[OR]]
+;
+ %zextX = zext i1 %X to i32
+ %zextY = zext i1 %Y to i32
+ %notX = xor i32 %zextX, 1
+ %notY = xor i32 %zextY, 1
+ %or = or i32 %notX, %notY
+ ret i32 %or
+}
+
+define i32 @demorgan_and_zext(i1 %X, i1 %Y) {
+; CHECK-LABEL: @demorgan_and_zext(
+; CHECK-NEXT: [[AND1_DEMORGAN:%.*]] = or i1 %X, %Y
+; CHECK-NEXT: [[AND1:%.*]] = xor i1 [[AND1_DEMORGAN]], true
+; CHECK-NEXT: [[AND:%.*]] = zext i1 [[AND:%.*]]1 to i32
+; CHECK-NEXT: ret i32 [[AND]]
+;
+ %zextX = zext i1 %X to i32
+ %zextY = zext i1 %Y to i32
+ %notX = xor i32 %zextX, 1
+ %notY = xor i32 %zextY, 1
+ %and = and i32 %notX, %notY
+ ret i32 %and
+}
+
+define <2 x i32> @demorgan_or_zext_vec(<2 x i1> %X, <2 x i1> %Y) {
+; CHECK-LABEL: @demorgan_or_zext_vec(
+; CHECK-NEXT: [[OR1_DEMORGAN:%.*]] = and <2 x i1> %X, %Y
+; CHECK-NEXT: [[OR1:%.*]] = xor <2 x i1> [[OR1_DEMORGAN]], <i1 true, i1 true>
+; CHECK-NEXT: [[OR:%.*]] = zext <2 x i1> [[OR:%.*]]1 to <2 x i32>
+; CHECK-NEXT: ret <2 x i32> [[OR]]
+;
+ %zextX = zext <2 x i1> %X to <2 x i32>
+ %zextY = zext <2 x i1> %Y to <2 x i32>
+ %notX = xor <2 x i32> %zextX, <i32 1, i32 1>
+ %notY = xor <2 x i32> %zextY, <i32 1, i32 1>
+ %or = or <2 x i32> %notX, %notY
+ ret <2 x i32> %or
+}
+
+define <2 x i32> @demorgan_and_zext_vec(<2 x i1> %X, <2 x i1> %Y) {
+; CHECK-LABEL: @demorgan_and_zext_vec(
+; CHECK-NEXT: [[AND1_DEMORGAN:%.*]] = or <2 x i1> %X, %Y
+; CHECK-NEXT: [[AND1:%.*]] = xor <2 x i1> [[AND1_DEMORGAN]], <i1 true, i1 true>
+; CHECK-NEXT: [[AND:%.*]] = zext <2 x i1> [[AND:%.*]]1 to <2 x i32>
+; CHECK-NEXT: ret <2 x i32> [[AND]]
+;
+ %zextX = zext <2 x i1> %X to <2 x i32>
+ %zextY = zext <2 x i1> %Y to <2 x i32>
+ %notX = xor <2 x i32> %zextX, <i32 1, i32 1>
+ %notY = xor <2 x i32> %zextY, <i32 1, i32 1>
+ %and = and <2 x i32> %notX, %notY
+ ret <2 x i32> %and
+}
+
+define i32 @PR28476(i32 %x, i32 %y) {
+; CHECK-LABEL: @PR28476(
+; CHECK-NEXT: [[CMP0:%.*]] = icmp eq i32 %x, 0
+; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i32 %y, 0
+; CHECK-NEXT: [[TMP1:%.*]] = or i1 [[CMP1]], [[CMP0]]
+; CHECK-NEXT: [[COND:%.*]] = zext i1 [[TMP1]] to i32
+; CHECK-NEXT: ret i32 [[COND]]
+;
+ %cmp0 = icmp ne i32 %x, 0
+ %cmp1 = icmp ne i32 %y, 0
+ %and = and i1 %cmp0, %cmp1
+ %zext = zext i1 %and to i32
+ %cond = xor i32 %zext, 1
+ ret i32 %cond
+}
+
+; ~(~(a | b) | (a & b)) --> (a | b) & ~(a & b) -> a ^ b
+
+define i32 @demorgan_plus_and_to_xor(i32 %a, i32 %b) {
+; CHECK-LABEL: @demorgan_plus_and_to_xor(
+; CHECK-NEXT: [[NOT:%.*]] = xor i32 %b, %a
+; CHECK-NEXT: ret i32 [[NOT]]
+;
+ %or = or i32 %b, %a
+ %notor = xor i32 %or, -1
+ %and = and i32 %b, %a
+ %or2 = or i32 %and, %notor
+ %not = xor i32 %or2, -1
+ ret i32 %not
+}
+
+define <4 x i32> @demorgan_plus_and_to_xor_vec(<4 x i32> %a, <4 x i32> %b) {
+; CHECK-LABEL: @demorgan_plus_and_to_xor_vec(
+; CHECK-NEXT: [[NOT:%.*]] = xor <4 x i32> %a, %b
+; CHECK-NEXT: ret <4 x i32> [[NOT]]
+;
+ %or = or <4 x i32> %a, %b
+ %notor = xor <4 x i32> %or, < i32 -1, i32 -1, i32 -1, i32 -1 >
+ %and = and <4 x i32> %a, %b
+ %or2 = or <4 x i32> %and, %notor
+ %not = xor <4 x i32> %or2, < i32 -1, i32 -1, i32 -1, i32 -1 >
+ ret <4 x i32> %not
+}
+
generated by cgit v1.3 (git 2.53.0) at 2026-09-03 05:23:05 +0000