Implement some missing maths-related intrinsics

Author: tomaka

src/library.js

@@ -1398,10 +1398,16 @@ LibraryManager.library = {
   llvm_sqrt_f64: 'Math_sqrt',
   llvm_pow_f32: 'Math_pow',
   llvm_pow_f64: 'Math_pow',
+  llvm_powi_f32: 'Math_pow',
+  llvm_powi_f64: 'Math_pow',
   llvm_log_f32: 'Math_log',
   llvm_log_f64: 'Math_log',
   llvm_exp_f32: 'Math_exp',
   llvm_exp_f64: 'Math_exp',
+  llvm_trunc_f32: 'Math_trunc',
+  llvm_trunc_f64: 'Math_trunc',
+  llvm_floor_f32: 'Math_floor',
+  llvm_floor_f64: 'Math_floor',
 
   round__asm: true,
   round__sig: 'dd',

src/preamble.js

@@ -1746,6 +1746,11 @@ if (!Math['clz32']) Math['clz32'] = function(x) {
 };
 Math.clz32 = Math['clz32']
 
+if (!Math['trunc']) Math['trunc'] = function(x) {
+  return x < 0 ? Math.ceil(x) : Math.floor(x);
+};
+Math.trunc = Math['trunc'];
+
 var Math_abs = Math.abs;
 var Math_cos = Math.cos;
 var Math_sin = Math.sin;
@@ -1764,6 +1769,7 @@ var Math_imul = Math.imul;
 var Math_fround = Math.fround;
 var Math_min = Math.min;
 var Math_clz32 = Math.clz32;
+var Math_trunc = Math.trunc;
 
 // A counter of dependencies for calling run(). If we need to
 // do asynchronous work before running, increment this and

tests/core/test_llvm_intrinsics.in

@@ -11,6 +11,12 @@ extern int64_t llvm_cttz_i64(int64_t x, int izZeroUndef);
 extern int32_t llvm_ctpop_i32(int32_t x);
 extern int64_t llvm_ctpop_i64(int64_t x);
 extern int llvm_expect_i32(int x, int y);
+extern float llvm_powi_f32(float x, int32_t y);
+extern double llvm_powi_f64(double x, int32_t y);
+extern float llvm_trunc_f32(float x);
+extern double llvm_trunc_f64(double x);
+extern float llvm_floor_f32(float x);
+extern double llvm_floor_f64(double x);
 }
 
 int main(void) {
@@ -40,5 +46,12 @@ int main(void) {
   a = __builtin_bswap64(a);
   printf("%lld\n", a);
 
+  printf("%d\n", (int)llvm_powi_f32(5.0f, 3));
+  printf("%d\n", (int)llvm_powi_f64(3.0, 5));
+  printf("%d\n", (int)llvm_trunc_f32(18.0987f));
+  printf("%d\n", (int)llvm_trunc_f64(-12.42));
+  printf("%d\n", (int)llvm_floor_f32(27.665f));
+  printf("%d\n", (int)llvm_floor_f64(-8.95));
+
   return 0;
 }

tests/core/test_llvm_intrinsics.out

@@ -8,3 +8,9 @@ c5,de,15,8a
 22
 13
 72057594037927936
+125
+243
+18
+-12
+27
+-9