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dd0344f002
For the common pattern (CMPZ (AND x, #bitmask), #0), we can do some more efficient instruction selection if the bitmask is one consecutive sequence of set bits (32 - clz(bm) - ctz(bm) == popcount(bm)). 1) If the bitmask touches the LSB, then we can remove all the upper bits and set the flags by doing one LSLS. 2) If the bitmask touches the MSB, then we can remove all the lower bits and set the flags with one LSRS. 3) If the bitmask has popcount == 1 (only one set bit), we can shift that bit into the sign bit with one LSLS and change the condition query from NE/EQ to MI/PL (we could also implement this by shifting into the carry bit and branching on BCC/BCS). 4) Otherwise, we can emit a sequence of LSLS+LSRS to remove the upper and lower zero bits of the mask. 1-3 require only one 16-bit instruction and can elide the CMP. 4 requires two 16-bit instructions but can elide the CMP and doesn't require materializing a complex immediate, so is also a win. llvm-svn: 281215
292 lines
6.2 KiB
LLVM
292 lines
6.2 KiB
LLVM
; RUN: llc < %s -mtriple=thumbv7-none-eabi -mcpu=cortex-m3 | FileCheck %s -check-prefix=CHECK -check-prefix=NONE
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; RUN: llc < %s -mtriple=thumbv7-none-eabihf -mcpu=cortex-m4 | FileCheck %s -check-prefix=CHECK -check-prefix=HARD -check-prefix=SP -check-prefix=VFP4-ALL
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; RUN: llc < %s -mtriple=thumbv7-none-eabihf -mcpu=cortex-m7 | FileCheck %s -check-prefix=CHECK -check-prefix=HARD -check-prefix=DP -check-prefix=FP-ARMv8
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; RUN: llc < %s -mtriple=thumbv7-none-eabihf -mcpu=cortex-a8 | FileCheck %s -check-prefix=CHECK -check-prefix=HARD -check-prefix=DP -check-prefix=VFP4-ALL -check-prefix=VFP4-DP
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define float @add_f(float %a, float %b) {
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entry:
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; CHECK-LABEL: add_f:
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; NONE: bl __aeabi_fadd
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; HARD: vadd.f32 s0, s0, s1
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%0 = fadd float %a, %b
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ret float %0
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}
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define double @add_d(double %a, double %b) {
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entry:
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; CHECK-LABEL: add_d:
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; NONE: bl __aeabi_dadd
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; SP: bl __aeabi_dadd
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; DP: vadd.f64 d0, d0, d1
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%0 = fadd double %a, %b
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ret double %0
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}
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define float @sub_f(float %a, float %b) {
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entry:
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; CHECK-LABEL: sub_f:
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; NONE: bl __aeabi_fsub
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; HARD: vsub.f32 s
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%0 = fsub float %a, %b
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ret float %0
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}
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define double @sub_d(double %a, double %b) {
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entry:
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; CHECK-LABEL: sub_d:
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; NONE: bl __aeabi_dsub
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; SP: bl __aeabi_dsub
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; DP: vsub.f64 d0, d0, d1
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%0 = fsub double %a, %b
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ret double %0
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}
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define float @mul_f(float %a, float %b) {
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entry:
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; CHECK-LABEL: mul_f:
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; NONE: bl __aeabi_fmul
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; HARD: vmul.f32 s
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%0 = fmul float %a, %b
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ret float %0
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}
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define double @mul_d(double %a, double %b) {
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entry:
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; CHECK-LABEL: mul_d:
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; NONE: bl __aeabi_dmul
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; SP: bl __aeabi_dmul
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; DP: vmul.f64 d0, d0, d1
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%0 = fmul double %a, %b
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ret double %0
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}
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define float @div_f(float %a, float %b) {
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entry:
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; CHECK-LABEL: div_f:
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; NONE: bl __aeabi_fdiv
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; HARD: vdiv.f32 s
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%0 = fdiv float %a, %b
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ret float %0
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}
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define double @div_d(double %a, double %b) {
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entry:
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; CHECK-LABEL: div_d:
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; NONE: bl __aeabi_ddiv
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; SP: bl __aeabi_ddiv
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; DP: vdiv.f64 d0, d0, d1
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%0 = fdiv double %a, %b
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ret double %0
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}
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define float @rem_f(float %a, float %b) {
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entry:
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; CHECK-LABEL: rem_f:
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; NONE: bl fmodf
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; HARD: b fmodf
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%0 = frem float %a, %b
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ret float %0
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}
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define double @rem_d(double %a, double %b) {
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entry:
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; CHECK-LABEL: rem_d:
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; NONE: bl fmod
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; HARD: b fmod
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%0 = frem double %a, %b
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ret double %0
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}
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define float @load_f(float* %a) {
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entry:
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; CHECK-LABEL: load_f:
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; NONE: ldr r0, [r0]
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; HARD: vldr s0, [r0]
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%0 = load float, float* %a, align 4
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ret float %0
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}
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define double @load_d(double* %a) {
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entry:
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; CHECK-LABEL: load_d:
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; NONE: ldm r0, {r0, r1}
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; HARD: vldr d0, [r0]
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%0 = load double, double* %a, align 8
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ret double %0
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}
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define void @store_f(float* %a, float %b) {
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entry:
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; CHECK-LABEL: store_f:
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; NONE: str r1, [r0]
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; HARD: vstr s0, [r0]
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store float %b, float* %a, align 4
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ret void
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}
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define void @store_d(double* %a, double %b) {
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entry:
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; CHECK-LABEL: store_d:
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; NONE: strd r2, r3, [r0]
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; HARD: vstr d0, [r0]
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store double %b, double* %a, align 8
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ret void
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}
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define double @f_to_d(float %a) {
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; CHECK-LABEL: f_to_d:
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; NONE: bl __aeabi_f2d
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; SP: bl __aeabi_f2d
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; DP: vcvt.f64.f32 d0, s0
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%1 = fpext float %a to double
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ret double %1
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}
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define float @d_to_f(double %a) {
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; CHECK-LABEL: d_to_f:
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; NONE: bl __aeabi_d2f
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; SP: bl __aeabi_d2f
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; DP: vcvt.f32.f64 s0, d0
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%1 = fptrunc double %a to float
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ret float %1
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}
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define i32 @f_to_si(float %a) {
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; CHECK-LABEL: f_to_si:
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; NONE: bl __aeabi_f2iz
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; HARD: vcvt.s32.f32 s0, s0
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; HARD: vmov r0, s0
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%1 = fptosi float %a to i32
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ret i32 %1
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}
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define i32 @d_to_si(double %a) {
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; CHECK-LABEL: d_to_si:
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; NONE: bl __aeabi_d2iz
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; SP: vmov r0, r1, d0
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; SP: bl __aeabi_d2iz
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; DP: vcvt.s32.f64 s0, d0
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; DP: vmov r0, s0
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%1 = fptosi double %a to i32
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ret i32 %1
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}
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define i32 @f_to_ui(float %a) {
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; CHECK-LABEL: f_to_ui:
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; NONE: bl __aeabi_f2uiz
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; HARD: vcvt.u32.f32 s0, s0
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; HARD: vmov r0, s0
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%1 = fptoui float %a to i32
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ret i32 %1
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}
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define i32 @d_to_ui(double %a) {
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; CHECK-LABEL: d_to_ui:
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; NONE: bl __aeabi_d2uiz
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; SP: vmov r0, r1, d0
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; SP: bl __aeabi_d2uiz
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; DP: vcvt.u32.f64 s0, d0
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; DP: vmov r0, s0
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%1 = fptoui double %a to i32
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ret i32 %1
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}
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define float @si_to_f(i32 %a) {
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; CHECK-LABEL: si_to_f:
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; NONE: bl __aeabi_i2f
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; HARD: vcvt.f32.s32 s0, s0
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%1 = sitofp i32 %a to float
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ret float %1
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}
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define double @si_to_d(i32 %a) {
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; CHECK-LABEL: si_to_d:
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; NONE: bl __aeabi_i2d
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; SP: bl __aeabi_i2d
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; DP: vcvt.f64.s32 d0, s0
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%1 = sitofp i32 %a to double
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ret double %1
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}
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define float @ui_to_f(i32 %a) {
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; CHECK-LABEL: ui_to_f:
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; NONE: bl __aeabi_ui2f
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; HARD: vcvt.f32.u32 s0, s0
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%1 = uitofp i32 %a to float
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ret float %1
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}
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define double @ui_to_d(i32 %a) {
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; CHECK-LABEL: ui_to_d:
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; NONE: bl __aeabi_ui2d
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; SP: bl __aeabi_ui2d
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; DP: vcvt.f64.u32 d0, s0
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%1 = uitofp i32 %a to double
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ret double %1
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}
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define float @bitcast_i_to_f(i32 %a) {
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; CHECK-LABEL: bitcast_i_to_f:
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; NONE-NOT: mov
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; HARD: vmov s0, r0
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%1 = bitcast i32 %a to float
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ret float %1
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}
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define double @bitcast_i_to_d(i64 %a) {
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; CHECK-LABEL: bitcast_i_to_d:
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; NONE-NOT: mov
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; HARD: vmov d0, r0, r1
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%1 = bitcast i64 %a to double
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ret double %1
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}
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define i32 @bitcast_f_to_i(float %a) {
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; CHECK-LABEL: bitcast_f_to_i:
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; NONE-NOT: mov
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; HARD: vmov r0, s0
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%1 = bitcast float %a to i32
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ret i32 %1
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}
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define i64 @bitcast_d_to_i(double %a) {
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; CHECK-LABEL: bitcast_d_to_i:
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; NONE-NOT: mov
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; HARD: vmov r0, r1, d0
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%1 = bitcast double %a to i64
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ret i64 %1
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}
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define float @select_f(float %a, float %b, i1 %c) {
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; CHECK-LABEL: select_f:
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; NONE: lsls r2, r2, #31
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; NONE: moveq r0, r1
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; HARD: lsls r0, r0, #31
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; VFP4-ALL: vmovne.f32 s1, s0
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; VFP4-ALL: vmov.f32 s0, s1
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; FP-ARMv8: vseleq.f32 s0, s1, s0
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%1 = select i1 %c, float %a, float %b
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ret float %1
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}
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define double @select_d(double %a, double %b, i1 %c) {
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; CHECK-LABEL: select_d:
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; NONE: ldr{{(.w)?}} [[REG:r[0-9]+]], [sp]
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; NONE: lsls{{(.w)?}} [[REG]], [[REG]], #31
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; NONE: moveq r0, r2
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; NONE: moveq r1, r3
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; SP: lsls r0, r0, #31
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; SP-DAG: vmov [[ALO:r[0-9]+]], [[AHI:r[0-9]+]], d0
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; SP-DAG: vmov [[BLO:r[0-9]+]], [[BHI:r[0-9]+]], d1
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; SP: itt ne
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; SP-DAG: movne [[BLO]], [[ALO]]
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; SP-DAG: movne [[BHI]], [[AHI]]
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; SP: vmov d0, [[BLO]], [[BHI]]
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; DP: lsls r0, r0, #31
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; VFP4-DP: vmovne.f64 d1, d0
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; VFP4-DP: vmov.f64 d0, d1
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; FP-ARMV8: vseleq.f64 d0, d1, d0
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%1 = select i1 %c, double %a, double %b
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ret double %1
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}
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