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llvm-6502/test/CodeGen/AArch64/arm64-ldp.ll
Quentin Colombet 05a3f9120a [AArch64][LoadStoreOptimizer] Generate LDP + SXTW instead of LD[U]R + LD[U]RSW. 
Teach the load store optimizer how to sign extend a result of a load pair when
it helps creating more pairs.
The rational is that loads are more expensive than sign extensions, so if we
gather some in one instruction this is better!

<rdar://problem/20072968>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231527 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-06 22:42:10 +00:00

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; RUN: llc < %s -march=arm64 -verify-machineinstrs | FileCheck %s
; RUN: llc < %s -march=arm64 -aarch64-unscaled-mem-op=true\
; RUN: -verify-machineinstrs | FileCheck -check-prefix=LDUR_CHK %s
; CHECK: ldp_int
; CHECK: ldp
define i32 @ldp_int(i32* %p) nounwind {
%tmp = load i32, i32* %p, align 4
%add.ptr = getelementptr inbounds i32, i32* %p, i64 1
%tmp1 = load i32, i32* %add.ptr, align 4
%add = add nsw i32 %tmp1, %tmp
ret i32 %add
}
; CHECK: ldp_sext_int
; CHECK: ldpsw
define i64 @ldp_sext_int(i32* %p) nounwind {
%tmp = load i32, i32* %p, align 4
%add.ptr = getelementptr inbounds i32, i32* %p, i64 1
%tmp1 = load i32, i32* %add.ptr, align 4
%sexttmp = sext i32 %tmp to i64
%sexttmp1 = sext i32 %tmp1 to i64
%add = add nsw i64 %sexttmp1, %sexttmp
ret i64 %add
}
; CHECK-LABEL: ldp_half_sext_res0_int:
; CHECK: ldp w[[DST1:[0-9]+]], w[[DST2:[0-9]+]], [x0]
; CHECK: sxtw x[[DST1]], w[[DST1]]
define i64 @ldp_half_sext_res0_int(i32* %p) nounwind {
%tmp = load i32, i32* %p, align 4
%add.ptr = getelementptr inbounds i32, i32* %p, i64 1
%tmp1 = load i32, i32* %add.ptr, align 4
%sexttmp = sext i32 %tmp to i64
%sexttmp1 = zext i32 %tmp1 to i64
%add = add nsw i64 %sexttmp1, %sexttmp
ret i64 %add
}
; CHECK-LABEL: ldp_half_sext_res1_int:
; CHECK: ldp w[[DST1:[0-9]+]], w[[DST2:[0-9]+]], [x0]
; CHECK: sxtw x[[DST2]], w[[DST2]]
define i64 @ldp_half_sext_res1_int(i32* %p) nounwind {
%tmp = load i32, i32* %p, align 4
%add.ptr = getelementptr inbounds i32, i32* %p, i64 1
%tmp1 = load i32, i32* %add.ptr, align 4
%sexttmp = zext i32 %tmp to i64
%sexttmp1 = sext i32 %tmp1 to i64
%add = add nsw i64 %sexttmp1, %sexttmp
ret i64 %add
}
; CHECK: ldp_long
; CHECK: ldp
define i64 @ldp_long(i64* %p) nounwind {
%tmp = load i64, i64* %p, align 8
%add.ptr = getelementptr inbounds i64, i64* %p, i64 1
%tmp1 = load i64, i64* %add.ptr, align 8
%add = add nsw i64 %tmp1, %tmp
ret i64 %add
}
; CHECK: ldp_float
; CHECK: ldp
define float @ldp_float(float* %p) nounwind {
%tmp = load float, float* %p, align 4
%add.ptr = getelementptr inbounds float, float* %p, i64 1
%tmp1 = load float, float* %add.ptr, align 4
%add = fadd float %tmp, %tmp1
ret float %add
}
; CHECK: ldp_double
; CHECK: ldp
define double @ldp_double(double* %p) nounwind {
%tmp = load double, double* %p, align 8
%add.ptr = getelementptr inbounds double, double* %p, i64 1
%tmp1 = load double, double* %add.ptr, align 8
%add = fadd double %tmp, %tmp1
ret double %add
}
; Test the load/store optimizer---combine ldurs into a ldp, if appropriate
define i32 @ldur_int(i32* %a) nounwind {
; LDUR_CHK: ldur_int
; LDUR_CHK: ldp [[DST1:w[0-9]+]], [[DST2:w[0-9]+]], [x0, #-8]
; LDUR_CHK-NEXT: add w{{[0-9]+}}, [[DST2]], [[DST1]]
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds i32, i32* %a, i32 -1
%tmp1 = load i32, i32* %p1, align 2
%p2 = getelementptr inbounds i32, i32* %a, i32 -2
%tmp2 = load i32, i32* %p2, align 2
%tmp3 = add i32 %tmp1, %tmp2
ret i32 %tmp3
}
define i64 @ldur_sext_int(i32* %a) nounwind {
; LDUR_CHK: ldur_sext_int
; LDUR_CHK: ldpsw [[DST1:x[0-9]+]], [[DST2:x[0-9]+]], [x0, #-8]
; LDUR_CHK-NEXT: add x{{[0-9]+}}, [[DST2]], [[DST1]]
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds i32, i32* %a, i32 -1
%tmp1 = load i32, i32* %p1, align 2
%p2 = getelementptr inbounds i32, i32* %a, i32 -2
%tmp2 = load i32, i32* %p2, align 2
%sexttmp1 = sext i32 %tmp1 to i64
%sexttmp2 = sext i32 %tmp2 to i64
%tmp3 = add i64 %sexttmp1, %sexttmp2
ret i64 %tmp3
}
define i64 @ldur_half_sext_int_res0(i32* %a) nounwind {
; LDUR_CHK: ldur_half_sext_int_res0
; LDUR_CHK: ldp w[[DST1:[0-9]+]], w[[DST2:[0-9]+]], [x0, #-8]
; LDUR_CHK: sxtw x[[DST1]], w[[DST1]]
; LDUR_CHK-NEXT: add x{{[0-9]+}}, x[[DST2]], x[[DST1]]
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds i32, i32* %a, i32 -1
%tmp1 = load i32, i32* %p1, align 2
%p2 = getelementptr inbounds i32, i32* %a, i32 -2
%tmp2 = load i32, i32* %p2, align 2
%sexttmp1 = zext i32 %tmp1 to i64
%sexttmp2 = sext i32 %tmp2 to i64
%tmp3 = add i64 %sexttmp1, %sexttmp2
ret i64 %tmp3
}
define i64 @ldur_half_sext_int_res1(i32* %a) nounwind {
; LDUR_CHK: ldur_half_sext_int_res1
; LDUR_CHK: ldp w[[DST1:[0-9]+]], w[[DST2:[0-9]+]], [x0, #-8]
; LDUR_CHK: sxtw x[[DST2]], w[[DST2]]
; LDUR_CHK-NEXT: add x{{[0-9]+}}, x[[DST2]], x[[DST1]]
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds i32, i32* %a, i32 -1
%tmp1 = load i32, i32* %p1, align 2
%p2 = getelementptr inbounds i32, i32* %a, i32 -2
%tmp2 = load i32, i32* %p2, align 2
%sexttmp1 = sext i32 %tmp1 to i64
%sexttmp2 = zext i32 %tmp2 to i64
%tmp3 = add i64 %sexttmp1, %sexttmp2
ret i64 %tmp3
}
define i64 @ldur_long(i64* %a) nounwind ssp {
; LDUR_CHK: ldur_long
; LDUR_CHK: ldp [[DST1:x[0-9]+]], [[DST2:x[0-9]+]], [x0, #-16]
; LDUR_CHK-NEXT: add x{{[0-9]+}}, [[DST2]], [[DST1]]
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds i64, i64* %a, i64 -1
%tmp1 = load i64, i64* %p1, align 2
%p2 = getelementptr inbounds i64, i64* %a, i64 -2
%tmp2 = load i64, i64* %p2, align 2
%tmp3 = add i64 %tmp1, %tmp2
ret i64 %tmp3
}
define float @ldur_float(float* %a) {
; LDUR_CHK: ldur_float
; LDUR_CHK: ldp [[DST1:s[0-9]+]], [[DST2:s[0-9]+]], [x0, #-8]
; LDUR_CHK-NEXT: add s{{[0-9]+}}, [[DST2]], [[DST1]]
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds float, float* %a, i64 -1
%tmp1 = load float, float* %p1, align 2
%p2 = getelementptr inbounds float, float* %a, i64 -2
%tmp2 = load float, float* %p2, align 2
%tmp3 = fadd float %tmp1, %tmp2
ret float %tmp3
}
define double @ldur_double(double* %a) {
; LDUR_CHK: ldur_double
; LDUR_CHK: ldp [[DST1:d[0-9]+]], [[DST2:d[0-9]+]], [x0, #-16]
; LDUR_CHK-NEXT: add d{{[0-9]+}}, [[DST2]], [[DST1]]
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds double, double* %a, i64 -1
%tmp1 = load double, double* %p1, align 2
%p2 = getelementptr inbounds double, double* %a, i64 -2
%tmp2 = load double, double* %p2, align 2
%tmp3 = fadd double %tmp1, %tmp2
ret double %tmp3
}
; Now check some boundary conditions
define i64 @pairUpBarelyIn(i64* %a) nounwind ssp {
; LDUR_CHK: pairUpBarelyIn
; LDUR_CHK-NOT: ldur
; LDUR_CHK: ldp [[DST1:x[0-9]+]], [[DST2:x[0-9]+]], [x0, #-256]
; LDUR_CHK-NEXT: add x{{[0-9]+}}, [[DST2]], [[DST1]]
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds i64, i64* %a, i64 -31
%tmp1 = load i64, i64* %p1, align 2
%p2 = getelementptr inbounds i64, i64* %a, i64 -32
%tmp2 = load i64, i64* %p2, align 2
%tmp3 = add i64 %tmp1, %tmp2
ret i64 %tmp3
}
define i64 @pairUpBarelyInSext(i32* %a) nounwind ssp {
; LDUR_CHK: pairUpBarelyInSext
; LDUR_CHK-NOT: ldur
; LDUR_CHK: ldpsw [[DST1:x[0-9]+]], [[DST2:x[0-9]+]], [x0, #-256]
; LDUR_CHK-NEXT: add x{{[0-9]+}}, [[DST2]], [[DST1]]
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds i32, i32* %a, i64 -63
%tmp1 = load i32, i32* %p1, align 2
%p2 = getelementptr inbounds i32, i32* %a, i64 -64
%tmp2 = load i32, i32* %p2, align 2
%sexttmp1 = sext i32 %tmp1 to i64
%sexttmp2 = sext i32 %tmp2 to i64
%tmp3 = add i64 %sexttmp1, %sexttmp2
ret i64 %tmp3
}
define i64 @pairUpBarelyInHalfSextRes0(i32* %a) nounwind ssp {
; LDUR_CHK: pairUpBarelyInHalfSextRes0
; LDUR_CHK-NOT: ldur
; LDUR_CHK: ldp w[[DST1:[0-9]+]], w[[DST2:[0-9]+]], [x0, #-256]
; LDUR_CHK: sxtw x[[DST1]], w[[DST1]]
; LDUR_CHK-NEXT: add x{{[0-9]+}}, x[[DST2]], x[[DST1]]
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds i32, i32* %a, i64 -63
%tmp1 = load i32, i32* %p1, align 2
%p2 = getelementptr inbounds i32, i32* %a, i64 -64
%tmp2 = load i32, i32* %p2, align 2
%sexttmp1 = zext i32 %tmp1 to i64
%sexttmp2 = sext i32 %tmp2 to i64
%tmp3 = add i64 %sexttmp1, %sexttmp2
ret i64 %tmp3
}
define i64 @pairUpBarelyInHalfSextRes1(i32* %a) nounwind ssp {
; LDUR_CHK: pairUpBarelyInHalfSextRes1
; LDUR_CHK-NOT: ldur
; LDUR_CHK: ldp w[[DST1:[0-9]+]], w[[DST2:[0-9]+]], [x0, #-256]
; LDUR_CHK: sxtw x[[DST2]], w[[DST2]]
; LDUR_CHK-NEXT: add x{{[0-9]+}}, x[[DST2]], x[[DST1]]
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds i32, i32* %a, i64 -63
%tmp1 = load i32, i32* %p1, align 2
%p2 = getelementptr inbounds i32, i32* %a, i64 -64
%tmp2 = load i32, i32* %p2, align 2
%sexttmp1 = sext i32 %tmp1 to i64
%sexttmp2 = zext i32 %tmp2 to i64
%tmp3 = add i64 %sexttmp1, %sexttmp2
ret i64 %tmp3
}
define i64 @pairUpBarelyOut(i64* %a) nounwind ssp {
; LDUR_CHK: pairUpBarelyOut
; LDUR_CHK-NOT: ldp
; Don't be fragile about which loads or manipulations of the base register
; are used---just check that there isn't an ldp before the add
; LDUR_CHK: add
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds i64, i64* %a, i64 -32
%tmp1 = load i64, i64* %p1, align 2
%p2 = getelementptr inbounds i64, i64* %a, i64 -33
%tmp2 = load i64, i64* %p2, align 2
%tmp3 = add i64 %tmp1, %tmp2
ret i64 %tmp3
}
define i64 @pairUpBarelyOutSext(i32* %a) nounwind ssp {
; LDUR_CHK: pairUpBarelyOutSext
; LDUR_CHK-NOT: ldp
; Don't be fragile about which loads or manipulations of the base register
; are used---just check that there isn't an ldp before the add
; LDUR_CHK: add
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds i32, i32* %a, i64 -64
%tmp1 = load i32, i32* %p1, align 2
%p2 = getelementptr inbounds i32, i32* %a, i64 -65
%tmp2 = load i32, i32* %p2, align 2
%sexttmp1 = sext i32 %tmp1 to i64
%sexttmp2 = sext i32 %tmp2 to i64
%tmp3 = add i64 %sexttmp1, %sexttmp2
ret i64 %tmp3
}
define i64 @pairUpNotAligned(i64* %a) nounwind ssp {
; LDUR_CHK: pairUpNotAligned
; LDUR_CHK-NOT: ldp
; LDUR_CHK: ldur
; LDUR_CHK-NEXT: ldur
; LDUR_CHK-NEXT: add
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds i64, i64* %a, i64 -18
%bp1 = bitcast i64* %p1 to i8*
%bp1p1 = getelementptr inbounds i8, i8* %bp1, i64 1
%dp1 = bitcast i8* %bp1p1 to i64*
%tmp1 = load i64, i64* %dp1, align 1
%p2 = getelementptr inbounds i64, i64* %a, i64 -17
%bp2 = bitcast i64* %p2 to i8*
%bp2p1 = getelementptr inbounds i8, i8* %bp2, i64 1
%dp2 = bitcast i8* %bp2p1 to i64*
%tmp2 = load i64, i64* %dp2, align 1
%tmp3 = add i64 %tmp1, %tmp2
ret i64 %tmp3
}
define i64 @pairUpNotAlignedSext(i32* %a) nounwind ssp {
; LDUR_CHK: pairUpNotAlignedSext
; LDUR_CHK-NOT: ldp
; LDUR_CHK: ldursw
; LDUR_CHK-NEXT: ldursw
; LDUR_CHK-NEXT: add
; LDUR_CHK-NEXT: ret
%p1 = getelementptr inbounds i32, i32* %a, i64 -18
%bp1 = bitcast i32* %p1 to i8*
%bp1p1 = getelementptr inbounds i8, i8* %bp1, i64 1
%dp1 = bitcast i8* %bp1p1 to i32*
%tmp1 = load i32, i32* %dp1, align 1
%p2 = getelementptr inbounds i32, i32* %a, i64 -17
%bp2 = bitcast i32* %p2 to i8*
%bp2p1 = getelementptr inbounds i8, i8* %bp2, i64 1
%dp2 = bitcast i8* %bp2p1 to i32*
%tmp2 = load i32, i32* %dp2, align 1
%sexttmp1 = sext i32 %tmp1 to i64
%sexttmp2 = sext i32 %tmp2 to i64
%tmp3 = add i64 %sexttmp1, %sexttmp2
ret i64 %tmp3
}
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