forked from OSchip/llvm-project
[X86] Enable the add with 128 -> sub with -128 encoding trick with X86ISD::ADD when the carry flag isn't used.
This allows us to use an 8-bit sign extended immediate instead of a 16 or 32 bit immediate. Also do similar for 0x80000000 with 64-bit adds to avoid having to use a movabsq. llvm-svn: 355485
This commit is contained in:
Craig Topper
parent
97a1c4c340
commit
c0e01d29a4
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@ -1491,6 +1491,13 @@ def : Pat<(add GR64:$src1, 128),
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def : Pat<(store (add (loadi64 addr:$dst), 128), addr:$dst),
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(SUB64mi8 addr:$dst, -128)>;
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def : Pat<(X86add_flag_nocf GR16:$src1, 128),
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(SUB16ri8 GR16:$src1, -128)>;
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def : Pat<(X86add_flag_nocf GR32:$src1, 128),
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(SUB32ri8 GR32:$src1, -128)>;
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def : Pat<(X86add_flag_nocf GR64:$src1, 128),
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(SUB64ri8 GR64:$src1, -128)>;
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// The same trick applies for 32-bit immediate fields in 64-bit
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// instructions.
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def : Pat<(add GR64:$src1, 0x0000000080000000),
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@ -1498,6 +1505,9 @@ def : Pat<(add GR64:$src1, 0x0000000080000000),
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def : Pat<(store (add (loadi64 addr:$dst), 0x0000000080000000), addr:$dst),
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(SUB64mi32 addr:$dst, 0xffffffff80000000)>;
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def : Pat<(X86add_flag_nocf GR64:$src1, 0x0000000080000000),
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(SUB64ri32 GR64:$src1, 0xffffffff80000000)>;
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// To avoid needing to materialize an immediate in a register, use a 32-bit and
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// with implicit zero-extension instead of a 64-bit and if the immediate has at
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// least 32 bits of leading zeros. If in addition the last 32 bits can be
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@ -507,3 +507,156 @@ define i32 @add_to_sub(i32 %a, i32 %b) {
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%r = add i32 %add, 1
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ret i32 %r
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}
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declare void @bar_i32(i32)
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declare void @bar_i64(i64)
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; Make sure we can use sub -128 for add 128 when the flags are used.
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define void @add_i32_128_flag(i32 %x) {
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; X32-LABEL: add_i32_128_flag:
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; X32: # %bb.0: # %entry
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; X32-NEXT: movl $128, %eax
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; X32-NEXT: addl {{[0-9]+}}(%esp), %eax
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; X32-NEXT: je .LBB17_2
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; X32-NEXT: # %bb.1: # %if.then
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; X32-NEXT: pushl %eax
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; X32-NEXT: .cfi_adjust_cfa_offset 4
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; X32-NEXT: calll bar_i32
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; X32-NEXT: addl $4, %esp
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; X32-NEXT: .cfi_adjust_cfa_offset -4
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; X32-NEXT: .LBB17_2: # %if.end
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; X32-NEXT: retl
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;
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; X64-LINUX-LABEL: add_i32_128_flag:
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; X64-LINUX: # %bb.0: # %entry
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; X64-LINUX-NEXT: subl $-128, %edi
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; X64-LINUX-NEXT: je .LBB17_1
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; X64-LINUX-NEXT: # %bb.2: # %if.then
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; X64-LINUX-NEXT: jmp bar_i32 # TAILCALL
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; X64-LINUX-NEXT: .LBB17_1: # %if.end
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; X64-LINUX-NEXT: retq
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;
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; X64-WIN32-LABEL: add_i32_128_flag:
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; X64-WIN32: # %bb.0: # %entry
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; X64-WIN32-NEXT: subl $-128, %ecx
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; X64-WIN32-NEXT: je .LBB17_1
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; X64-WIN32-NEXT: # %bb.2: # %if.then
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; X64-WIN32-NEXT: jmp bar_i32 # TAILCALL
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; X64-WIN32-NEXT: .LBB17_1: # %if.end
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; X64-WIN32-NEXT: retq
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entry:
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%add = add i32 %x, 128
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%tobool = icmp eq i32 %add, 0
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br i1 %tobool, label %if.end, label %if.then
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if.then:
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tail call void @bar_i32(i32 %add)
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br label %if.end
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if.end:
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ret void
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}
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; Make sure we can use sub -128 for add 128 when the flags are used.
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define void @add_i64_128_flag(i64 %x) {
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; X32-LABEL: add_i64_128_flag:
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; X32: # %bb.0: # %entry
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; X32-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X32-NEXT: movl $128, %eax
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; X32-NEXT: addl {{[0-9]+}}(%esp), %eax
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; X32-NEXT: adcl $0, %ecx
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; X32-NEXT: movl %eax, %edx
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; X32-NEXT: orl %ecx, %edx
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; X32-NEXT: je .LBB18_2
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; X32-NEXT: # %bb.1: # %if.then
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; X32-NEXT: pushl %ecx
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; X32-NEXT: .cfi_adjust_cfa_offset 4
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; X32-NEXT: pushl %eax
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; X32-NEXT: .cfi_adjust_cfa_offset 4
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; X32-NEXT: calll bar_i64
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; X32-NEXT: addl $8, %esp
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; X32-NEXT: .cfi_adjust_cfa_offset -8
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; X32-NEXT: .LBB18_2: # %if.end
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; X32-NEXT: retl
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;
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; X64-LINUX-LABEL: add_i64_128_flag:
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; X64-LINUX: # %bb.0: # %entry
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; X64-LINUX-NEXT: subq $-128, %rdi
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; X64-LINUX-NEXT: je .LBB18_1
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; X64-LINUX-NEXT: # %bb.2: # %if.then
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; X64-LINUX-NEXT: jmp bar_i64 # TAILCALL
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; X64-LINUX-NEXT: .LBB18_1: # %if.end
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; X64-LINUX-NEXT: retq
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;
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; X64-WIN32-LABEL: add_i64_128_flag:
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; X64-WIN32: # %bb.0: # %entry
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; X64-WIN32-NEXT: subq $-128, %rcx
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; X64-WIN32-NEXT: je .LBB18_1
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; X64-WIN32-NEXT: # %bb.2: # %if.then
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; X64-WIN32-NEXT: jmp bar_i64 # TAILCALL
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; X64-WIN32-NEXT: .LBB18_1: # %if.end
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; X64-WIN32-NEXT: retq
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entry:
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%add = add i64 %x, 128
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%tobool = icmp eq i64 %add, 0
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br i1 %tobool, label %if.end, label %if.then
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if.then:
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tail call void @bar_i64(i64 %add)
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br label %if.end
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if.end:
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ret void
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}
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; Make sure we can use sub -2147483648 for add 2147483648 when the flags are used.
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define void @add_i64_2147483648_flag(i64 %x) {
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; X32-LABEL: add_i64_2147483648_flag:
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; X32: # %bb.0: # %entry
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; X32-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X32-NEXT: movl $-2147483648, %eax # imm = 0x80000000
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; X32-NEXT: addl {{[0-9]+}}(%esp), %eax
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; X32-NEXT: adcl $0, %ecx
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; X32-NEXT: movl %eax, %edx
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; X32-NEXT: orl %ecx, %edx
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; X32-NEXT: je .LBB19_2
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; X32-NEXT: # %bb.1: # %if.then
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; X32-NEXT: pushl %ecx
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; X32-NEXT: .cfi_adjust_cfa_offset 4
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; X32-NEXT: pushl %eax
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; X32-NEXT: .cfi_adjust_cfa_offset 4
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; X32-NEXT: calll bar_i64
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; X32-NEXT: addl $8, %esp
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; X32-NEXT: .cfi_adjust_cfa_offset -8
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; X32-NEXT: .LBB19_2: # %if.end
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; X32-NEXT: retl
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;
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; X64-LINUX-LABEL: add_i64_2147483648_flag:
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; X64-LINUX: # %bb.0: # %entry
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; X64-LINUX-NEXT: subq $-2147483648, %rdi # imm = 0x80000000
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; X64-LINUX-NEXT: je .LBB19_1
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; X64-LINUX-NEXT: # %bb.2: # %if.then
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; X64-LINUX-NEXT: jmp bar_i64 # TAILCALL
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; X64-LINUX-NEXT: .LBB19_1: # %if.end
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; X64-LINUX-NEXT: retq
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;
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; X64-WIN32-LABEL: add_i64_2147483648_flag:
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; X64-WIN32: # %bb.0: # %entry
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; X64-WIN32-NEXT: subq $-2147483648, %rcx # imm = 0x80000000
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; X64-WIN32-NEXT: je .LBB19_1
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; X64-WIN32-NEXT: # %bb.2: # %if.then
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; X64-WIN32-NEXT: jmp bar_i64 # TAILCALL
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; X64-WIN32-NEXT: .LBB19_1: # %if.end
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; X64-WIN32-NEXT: retq
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entry:
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%add = add i64 %x, 2147483648
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%tobool = icmp eq i64 %add, 0
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br i1 %tobool, label %if.end, label %if.then
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if.then:
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tail call void @bar_i64(i64 %add)
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br label %if.end
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if.end:
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ret void
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}
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@ -293,10 +293,9 @@ define zeroext i1 @saddoi64imm4(i64 %v1, i64* %res) {
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define zeroext i1 @saddoi64imm5(i64 %v1, i64* %res) {
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; SDAG-LABEL: saddoi64imm5:
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; SDAG: ## %bb.0:
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; SDAG-NEXT: movl $2147483648, %ecx ## imm = 0x80000000
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; SDAG-NEXT: addq %rdi, %rcx
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; SDAG-NEXT: subq $-2147483648, %rdi ## imm = 0x80000000
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; SDAG-NEXT: seto %al
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; SDAG-NEXT: movq %rcx, (%rsi)
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; SDAG-NEXT: movq %rdi, (%rsi)
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; SDAG-NEXT: retq
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;
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; FAST-LABEL: saddoi64imm5:
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