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Add emulation for CPU without FMA instruction set #59

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Add emulation for CPU without FMA instruction set #59

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3 changes: 3 additions & 0 deletions src/llvm.h
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,9 @@ extern char *jitc_llvm_target_features;
/// Vector width of code generated by the LLVM backend
extern uint32_t jitc_llvm_vector_width;

/// CPU FMA instruction set support
extern bool jitc_llvm_fma_support;

/// Should the LLVM IR use typed (e.g., "i8*") or untyped ("ptr") pointers?
extern bool jitc_llvm_opaque_pointers;

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6 changes: 6 additions & 0 deletions src/llvm_core.cpp
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Expand Up @@ -43,6 +43,9 @@ char *jitc_llvm_target_features = nullptr;
/// Vector width of code generated by the LLVM backend
uint32_t jitc_llvm_vector_width = 0;

/// CPU FMA instruction set support
bool jitc_llvm_fma_support = false;

/// Should the LLVM IR use typed (e.g., "i8*") or untyped ("ptr") pointers?
bool jitc_llvm_opaque_pointers = false;

Expand Down Expand Up @@ -103,6 +106,9 @@ bool jitc_llvm_init() {
}
}

if (strstr(jitc_llvm_target_features, "+fma"))
jitc_llvm_fma_support = true;

jitc_llvm_vector_width = 1;

if (strstr(jitc_llvm_target_features, "+sse4.2"))
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15 changes: 11 additions & 4 deletions src/llvm_eval.cpp
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Expand Up @@ -519,10 +519,17 @@ static void jitc_llvm_render_var(uint32_t index, Variable *v) {

case VarKind::Fma:
if (jitc_is_float(v)) {
fmt_intrinsic("declare $T @llvm.fma.v$w$h($T, $T, $T)\n",
v, v, a0, a1, a2);
fmt(" $v = call $T @llvm.fma.v$w$h($V, $V, $V)\n",
v, v, v, a0, a1, a2);
if(jitc_llvm_fma_support) {
fmt_intrinsic("declare $T @llvm.fma.v$w$h($T, $T, $T)\n",
v, v, a0, a1, a2);
fmt(" $v = call $T @llvm.fma.v$w$h($V, $V, $V)\n",
v, v, v, a0, a1, a2);
} else {
fmt(" $v_0 = fmul $V, $v\n"
" $v = fadd $V_0, $v\n",
v, a0, a1,
v, v, a2);
}
} else {
fmt(" $v_0 = mul $V, $v\n"
" $v = add $V_0, $v\n",
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