diff --git a/target/i386/fpu_helper.c b/target/i386/fpu_helper.c
index 41f6f39..9c93f38 100644
--- a/target/i386/fpu_helper.c
+++ b/target/i386/fpu_helper.c
@@ -338,12 +338,36 @@
 
 int32_t helper_fisttl_ST0(CPUX86State *env)
 {
-    return floatx80_to_int32_round_to_zero(ST0, &env->fp_status);
+    int32_t val;
+    signed char old_exp_flags;
+
+    old_exp_flags = get_float_exception_flags(&env->fp_status);
+    set_float_exception_flags(0, &env->fp_status);
+
+    val = floatx80_to_int32_round_to_zero(ST0, &env->fp_status);
+    if (get_float_exception_flags(&env->fp_status) & float_flag_invalid) {
+        val = 0x80000000;
+    }
+    set_float_exception_flags(get_float_exception_flags(&env->fp_status)
+                                | old_exp_flags, &env->fp_status);
+    return val;
 }
 
 int64_t helper_fisttll_ST0(CPUX86State *env)
 {
-    return floatx80_to_int64_round_to_zero(ST0, &env->fp_status);
+    int64_t val;
+    signed char old_exp_flags;
+
+    old_exp_flags = get_float_exception_flags(&env->fp_status);
+    set_float_exception_flags(0, &env->fp_status);
+
+    val = floatx80_to_int64_round_to_zero(ST0, &env->fp_status);
+    if (get_float_exception_flags(&env->fp_status) & float_flag_invalid) {
+        val = 0x8000000000000000ULL;
+    }
+    set_float_exception_flags(get_float_exception_flags(&env->fp_status)
+                                | old_exp_flags, &env->fp_status);
+    return val;
 }
 
 void helper_fldt_ST0(CPUX86State *env, target_ulong ptr)
diff --git a/tests/tcg/i386/test-i386-fisttp.c b/tests/tcg/i386/test-i386-fisttp.c
new file mode 100644
index 0000000..16af59a
--- /dev/null
+++ b/tests/tcg/i386/test-i386-fisttp.c
@@ -0,0 +1,100 @@
+/* Test fisttpl and fisttpll instructions.  */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+union u {
+    struct { uint64_t sig; uint16_t sign_exp; } s;
+    long double ld;
+};
+
+volatile union u ld_invalid_1 = { .s = { 1, 1234 } };
+
+int main(void)
+{
+    int ret = 0;
+    int32_t res_32;
+    int64_t res_64;
+    __asm__ volatile ("fisttpl %0" : "=m" (res_32) : "t" (0x1p100L) : "st");
+    if (res_32 != INT32_MIN) {
+        printf("FAIL: fisttpl 0x1p100\n");
+        ret = 1;
+    }
+    __asm__ volatile ("fisttpl %0" : "=m" (res_32) : "t" (-0x1p100L) : "st");
+    if (res_32 != INT32_MIN) {
+        printf("FAIL: fisttpl -0x1p100\n");
+        ret = 1;
+    }
+    __asm__ volatile ("fisttpl %0" : "=m" (res_32) : "t" (__builtin_infl()) :
+                      "st");
+    if (res_32 != INT32_MIN) {
+        printf("FAIL: fisttpl inf\n");
+        ret = 1;
+    }
+    __asm__ volatile ("fisttpl %0" : "=m" (res_32) : "t" (-__builtin_infl()) :
+                      "st");
+    if (res_32 != INT32_MIN) {
+        printf("FAIL: fisttpl -inf\n");
+        ret = 1;
+    }
+    __asm__ volatile ("fisttpl %0" : "=m" (res_32) : "t" (__builtin_nanl("")) :
+                      "st");
+    if (res_32 != INT32_MIN) {
+        printf("FAIL: fisttpl nan\n");
+        ret = 1;
+    }
+    __asm__ volatile ("fisttpl %0" : "=m" (res_32) :
+                      "t" (-__builtin_nanl("")) : "st");
+    if (res_32 != INT32_MIN) {
+        printf("FAIL: fisttpl -nan\n");
+        ret = 1;
+    }
+    __asm__ volatile ("fisttpl %0" : "=m" (res_32) : "t" (ld_invalid_1.ld) :
+                      "st");
+    if (res_32 != INT32_MIN) {
+        printf("FAIL: fisttpl invalid\n");
+        ret = 1;
+    }
+    __asm__ volatile ("fisttpll %0" : "=m" (res_64) : "t" (0x1p100L) : "st");
+    if (res_64 != INT64_MIN) {
+        printf("FAIL: fisttpll 0x1p100\n");
+        ret = 1;
+    }
+    __asm__ volatile ("fisttpll %0" : "=m" (res_64) : "t" (-0x1p100L) : "st");
+    if (res_64 != INT64_MIN) {
+        printf("FAIL: fisttpll -0x1p100\n");
+        ret = 1;
+    }
+    __asm__ volatile ("fisttpll %0" : "=m" (res_64) : "t" (__builtin_infl()) :
+                      "st");
+    if (res_64 != INT64_MIN) {
+        printf("FAIL: fisttpll inf\n");
+        ret = 1;
+    }
+    __asm__ volatile ("fisttpll %0" : "=m" (res_64) : "t" (-__builtin_infl()) :
+                      "st");
+    if (res_64 != INT64_MIN) {
+        printf("FAIL: fisttpll -inf\n");
+        ret = 1;
+    }
+    __asm__ volatile ("fisttpll %0" : "=m" (res_64) :
+                      "t" (__builtin_nanl("")) : "st");
+    if (res_64 != INT64_MIN) {
+        printf("FAIL: fisttpll nan\n");
+        ret = 1;
+    }
+    __asm__ volatile ("fisttpll %0" : "=m" (res_64) :
+                      "t" (-__builtin_nanl("")) : "st");
+    if (res_64 != INT64_MIN) {
+        printf("FAIL: fisttpll -nan\n");
+        ret = 1;
+    }
+    __asm__ volatile ("fisttpll %0" : "=m" (res_64) : "t" (ld_invalid_1.ld) :
+                      "st");
+    if (res_64 != INT64_MIN) {
+        printf("FAIL: fisttpll invalid\n");
+        ret = 1;
+    }
+    return ret;
+}